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  Hasnain Tariq commented on Fatima Ahmed's classified listing.

  

  The weird music of Sarah and Ali - $5 Physics quiz

  The weird music of Sarah and Ali - $5 Physics quiz
   
  
  Along with her musical team band, Sarah wants to become a famous and worldwide selling artist. She is incredibly passionate about musical instruments, particularly in the acoustic guitar. Aside...

  • July 14, 2021

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    Farjana Lima For answering this question, at first we have to know how guitars work. There are various styles of guitars all which have different sounds and their unique sound comes from the materials of the strings and the composition of the bodies and also the air...  moreFor answering this question, at first we have to know how guitars work. There are various styles of guitars all which have different sounds and their unique sound comes from the materials of the strings and the composition of the bodies and also the air between them. There are six strings on a guitar each with an open notes of E2, A2,D3,G3, B3 and E4 and their corresponding frequences are 82 Hz, 110Hz, 147Hz, 196Hz, 247Hz,330Hz. These frequences represent the root tone of each string. So, when you play guitar, these strings transfer their sound into the body of the guitar where they set up an internal resonance on the air Chamber made by the body and cause the back plate and face plate to vibrate. And these vibration cause the air to compress and we hear the compression waves in the air as sound. So, this is how guitar works.
    For this reason, when sarah and Ali attemted sychronously to play acoustic guitar the same voicings , it created a moment of loud thumping noices.  less

    • July 12, 2021
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    Farjana Lima So, if sarah and Ali want to avoid this problem, they have to create some distance sonically between their acoustic guitars or they have to play different chord or different parts namely rhythm and leads while playing together.

    • July 12, 2021
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    Noorjahan Binte Farhana That is all about the noise vibration.
    Hearing range refers to the frequency of hearing that the senses of human and other animals are able to hear. Human hearing ranges from 20 Hz to 20,000 Hz frequency, but varies greatly from person to person. So...  moreThat is all about the noise vibration.
    Hearing range refers to the frequency of hearing that the senses of human and other animals are able to hear. Human hearing ranges from 20 Hz to 20,000 Hz frequency, but varies greatly from person to person. So when the acoustic guitar cross out the noise frequency and it's unable to our ear it creates a moment of loud thumping noise.  

    • July 13, 2021
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    Shadman Chowdhury When they were playing guitar, a loud thumping noise was produced due to the vibration of their playing, it caused some sort of interference. This would explain why when they are playing at the same time, there was an odd but clear sound that they were...  moreWhen they were playing guitar, a loud thumping noise was produced due to the vibration of their playing, it caused some sort of interference. This would explain why when they are playing at the same time, there was an odd but clear sound that they were not supposed to produce.
    
    The reason for this is because whenever any objects vibrate or moves, it produces interference. When one object moves in a particular direction or changes its motion suddenly, there will be waves forming in all directions. If another object has these waves hitting them as well while moving around by itself then there will be interference which will result in having waves being lost or changed.
    
    The concept of physics used is applied in the principle of interference. When two or more objects cause vibration or motion, there will be waves colliding with each other and either being canceled out or changed by a small fraction. This is an example of interference that can lead to many different problems down the road.  less

    • July 13, 2021
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    Zarin sadaf snigdha To answer this question we need to look at the principle of superposition of waves which states when 2 or more waves meet at a point the displacement or amplitude is equal to the vector summation of the amplitude of the individual waves. Here when they...  moreTo answer this question we need to look at the principle of superposition of waves which states when 2 or more waves meet at a point the displacement or amplitude is equal to the vector summation of the amplitude of the individual waves. Here when they both play the guitar simultaneously both of them produce waves of similar Frequency. These waves are produced interact with eachother & produce constructive & destructive superposition. This leads to amplitude at a few points to become double as displacement at that point is high. This leads to the loud noise as high amplitude is responsible for high sound. To avoid this they need to play different cords or change the frequency of the waves produced.  less

    • July 13, 2021
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    Tanveer Tausif Ratul The above phenomena is related to the terms-Interference and Superposition.When Sarah & Ali attempted to play
    the acoustic guitar synchronously,two sound waves were generated from two guiters at the exact same time.I mean each one produced the same...  moreThe above phenomena is related to the terms-Interference and Superposition.When Sarah & Ali attempted to play
    the acoustic guitar synchronously,two sound waves were generated from two guiters at the exact same time.I mean each one produced the same sound wave and both the waves were in same phase.Now,what is phase!
    
    
    If two waves have the same amplitude,same frequency and same wavelength,then it is said that both the waves are in same phase.
    
    
    So when two or more same-phased
    waves arrive at the same point (when both started playing their guitar),the waves superimpose themselves on one another.Actually the amplitudes of the wave superimpose.This term is known as-Superposition.So,the resultant wave will simply be the addition of the amplitudes of the individual waves.This superposition
    produces Constructive Interference which produces a wave that has twice the amplitude of the individual waves.The higher the amplitude,the louder the sound
    will be.
    
    
    On the other hand,it can be said very easily...    less

    • July 14, 2021
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    Tanveer Tausif Ratul that,when two waves are in opposite phase (their amplitude direction is opposite) & the superimpose on
    each other,the resulting amplitude is zero which is known as-Destructive Interference.It means the two waves cancel each other.Therefore,no sound will...  morethat,when two waves are in opposite phase (their amplitude direction is opposite) & the superimpose on
    each other,the resulting amplitude is zero which is known as-Destructive Interference.It means the two waves cancel each other.Therefore,no sound will be produced.
    
    From this discussion,it has been realized that when Sarah & Ali started playing at the same time,the sound waves generated from their instrument superimposed on each other and created the wave which had twice the amplitude of that individual wave.So a loud thumping noise was
    generated.But their ear were get used to it slowly.So,it didn’t affect that much later  less

    • July 14, 2021
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    Hasnain Tariq actually this happens due to resonance frequency . this is the frequency where superposition of waves can generate. same happen in the case of Sarah and Ali frequency of both musical instrument match suddenly this create loud thumping noise.

    • July 14, 2021
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  Andy Morales and The Rain - $5 Physics Quiz

  Andy Morales and the Rain - $5 Physics Quiz
   
  It's 6p.m, time to leave the railway station - Andy thought to himself, with a big sigh. Living a lonely life since the demise of his wife two years ago, everything to him seemed monotonous and tedious....

  • July 14, 2021

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    Hasnain Tariq Andy Morales follow the rule of moment arm. moment arm is the perpendicular distance b/w line of action and axis of rotation. In this case we will consider roots as an axis and other part is line of action . According to this rule if Andy Morales apply...  moreAndy Morales follow the rule of moment arm. moment arm is the perpendicular distance b/w line of action and axis of rotation. In this case we will consider roots as an axis and other part is line of action . According to this rule if Andy Morales apply force at axis of rotation . Tree will never move because moment arm is zero but they applied force at other end so tree move away easily  

    • July 12, 2021
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    Zarin sadaf snigdha Here Andy is following the laws of Moment. Here the roots are the axis of rotation & the tree is the line of action. If Andy applies force on the axis of rotation the tree will never move as it is the pivot point & Moment will be zero. But if he...  moreHere Andy is following the laws of Moment. Here the roots are the axis of rotation & the tree is the line of action. If Andy applies force on the axis of rotation the tree will never move as it is the pivot point & Moment will be zero. But if he applies force on the other side it will be on the line of action & this Moment will be maximum & the tree can be moved easily as it is at the point of tipping over due to the weight of the roots.  

    • July 12, 2021
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    Shadman Chowdhury The answer to this question is quite simple and straightforward. The force exerted (Trying to lift the tree) was, Tension force of rope=Tension force at a certain distance from the End of the rope= Force that would be required to push (lift) the car...  moreThe answer to this question is quite simple and straightforward. The force exerted (Trying to lift the tree) was, Tension force of rope=Tension force at a certain distance from the End of the rope= Force that would be required to push (lift) the car upwards if it were not attached to anything else.
    
    In physics it's called as- "The Loewy Effect"
    
    Now, when he went near the tree, it was easier to push upwards on car since it's a force acting in the opposite direction of his weight. AND thus, when Andy started pushing upwards, he seemed to be lifting it up instead of just pushing it up
    
    So, he was applying force on the car in such way that it seems like car is being lifted up. By pushing upwards at a certain distance from the root of tree, there was no weight (applied) in opposite direction and thus moving towards applied force gives him more effect than when pushing downwards.
    
    Thus, the force to lift the car was directly proportional to distance from tree's roots.  less

    • July 13, 2021
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    Tanveer Tausif Ratul Andy actually used the theory called-MOMENT.So the question is what is moment?Moment is the measure of the ability of a force to produce rotation/turning effect of an object about a fixed point or an axis.It can be measured by a simple formula which is...  moreAndy actually used the theory called-MOMENT.So the question is what is moment?Moment is the measure of the ability of a force to produce rotation/turning effect of an object about a fixed point or an axis.It can be measured by a simple formula which is M=r*F,where F is the applied force on that body, r is the perpendicular distance of the force from the center & M is the moment which will be produced for that force.From the equation,it can be said that,if the applied force is constant,then moment is proportional to the distance between center of the body and applied force.So,if the force is applied near the center point,the moment will be smaller which means it will be difficult to rotate that body.On the other hand,if the force is applied far from the center,the moment will be bigger which means it will be easier to rotate that object about the same center point.
    
    
    Now I will describe it using Andy’s phenomena.In that criteria the root of the tree was the center point mentioned above.Imagine those...    less

    • July 13, 2021
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    Tanveer Tausif Ratul people were applying 10N force.
    
    
    So when they were trying to uproot the tree from the bottom side,which means the applied force was near...  morepeople were applying 10N force.
    
    
    So when they were trying to uproot the tree from the bottom side,which means the applied force was near the
    center point(the root).As a result the moment became smaller and for that,it became very difficult to move the tree.But when Andy applied that same 10N force at the other side of the tree,the distance between the root and the force became much bigger.Then the moment was bigger than the previous one.So,it became easier to move the tree then.
    
    
    So the whole concept was about
    Moment of a force.  less

    • July 13, 2021
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    Hasnain Tariq hi Tanveer how you can assume that they need 10 N force to move the tree away . did you know 10 N is actually required to displace mass of 1.02 kg and i think mass of tree is much higher

    • July 14, 2021
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    Rohan Deb Because of Laws of Moment it was easier to lift the tree away from it roots. We have to apply Total Anticlockwise Moment=Total Clockwise Moment. Suppose the roots of the tree has a moment of 25N/m after falling onto the car. So in order to lift the tree...  moreBecause of Laws of Moment it was easier to lift the tree away from it roots. We have to apply Total Anticlockwise Moment=Total Clockwise Moment. Suppose the roots of the tree has a moment of 25N/m after falling onto the car. So in order to lift the tree from the car the same 25N/m of moment should be applied to the force acting away from the tree's roots.  

    • July 14, 2021
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    Moneera Chowdhury To push the tree up, you have to give a force that is bigger than the tree's weight. At a distance further from the roots, the distance you have to move the tree from the ground to upright is bigger than the distance closer to the roots. To make up for...  moreTo push the tree up, you have to give a force that is bigger than the tree's weight. At a distance further from the roots, the distance you have to move the tree from the ground to upright is bigger than the distance closer to the roots. To make up for the short distance, you have to give a powerful force, which makes it harder to push the tree up. The weight of the tree is spread out across the distance, a longer distance means the weight is more spread out, making it easier to lift the tree.  

    • July 15, 2021
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    Wafeeqa Hoque Mr. Morales implemented the concept of ‘moment’. Moment can be defined as the turning effect of a force around a pivot by the perpendicular/ at right angle distance between the pivot and force applied.
    -Pivot: Is the fixed point over which...  moreMr. Morales implemented the concept of ‘moment’. Moment can be defined as the turning effect of a force around a pivot by the perpendicular/ at right angle distance between the pivot and force applied.
    -Pivot: Is the fixed point over which something can turn or move about. For ex. In a wheelbarrow, the wheel will be the pivot.
    -Turning effect of force applied: This is simply the turning of the object about the pivot. For ex. A spanner being turned about a bolt (pivot) to tighten or loosen it.
    Here, the tree’s roots were still embedded in the ground and we know that fixed point forms the pivot. So if the roots are firmly in the ground, it won’t be possible to uproot the tree from the bottom end(roots’ side). If they tried lifting the tree over a short distance from the pivot, this would give the less efficient moment and would need a hefty amount of force. However, if the tree was lifted from the other end, force required is less and gives the proper result. This is basically because the...    less

    • July 15, 2021
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    Wafeeqa Hoque ...
    This is basically because the farther you are from the pivot, the lesser force required.

    • July 15, 2021
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    Abeer Muhammad Andy used what is called the turning effect of a force, also
    called the moment of a force. To understand this, we need to know a couple of
    things:...  moreAndy used what is called the turning effect of a force, also
    called the moment of a force. To understand this, we need to know a couple of
    things:
    
    
    a.
    There is a pivot (i.e. the point at which the
    object rotates)
    
    
    b.
    The effect of a force is greatest at the furthest
    distance possible from the pivot
    
    
    What the people there were doing wrong was that they were
    trying to lift the tree from near the pivot. However, the tree hadn’t
    completely uprooted and had little effect upon lifting the tree. Andy’s
    instincts told him to lift the tree at the furthest end from the pivot, meaning
    that the effect of the force will be at its peak. In doing so, they were able
    to save the person inside the car.  less

    • July 15, 2021
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    Arika Afrin Greater distance from the pivot, less force is required so in this case, the pivot is the root of the tree and if you are close to the pivot which is the root then it will require more force or it will be impossible to lift it up and Mr. Morales went to...  moreGreater distance from the pivot, less force is required so in this case, the pivot is the root of the tree and if you are close to the pivot which is the root then it will require more force or it will be impossible to lift it up and Mr. Morales went to the other side of the tree so away from the pivot so it required less force to lift it up.  

    • July 15, 2021
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    Jawadul Islam Chowdhury Imagine a wrench tightly fitted onto a nut. If you were to move the wrench from the head, a lot of energy would be required to do that. However, if you were to move the wrench from the head side, a lot less energy would be needed to move the wrench. The...  moreImagine a wrench tightly fitted onto a nut. If you were to move the wrench from the head, a lot of energy would be required to do that. However, if you were to move the wrench from the head side, a lot less energy would be needed to move the wrench. The same logic applies to the tree  

    • July 15, 2021
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    Syeda Anmol Andy used the ideology of moment. Moment of force is the idea to make a body to rotate on a pivot. Moment has a simple rule that is the closer you are to the pivot or the point the more energy you would require to rotate the body. This rule is obeyed by...  moreAndy used the ideology of moment. Moment of force is the idea to make a body to rotate on a pivot. Moment has a simple rule that is the closer you are to the pivot or the point the more energy you would require to rotate the body. This rule is obeyed by many objects which we use in our day-to-day life. Like a spanner handle is placed far from the pivot to rotate the nut or nail easier with less force. Similarly, in this case the pivot is the root of the tree, it is the turning point for the tree, when the crowd gathered they applied force very close to the pivot or the root this cause the tree not to budge but when Andy positioned the force on the far end from the pivot it made it easier for the crowd to move the tree. In simple, we can sum it up that the greater the distance the less the force needed and the smaller the distance the more force is needed which this scenario perfectly portrayed.  less

    • July 15, 2021
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    Nishat Tamanna Mr. Andy chimed in with the idea of momentum. Momentum is the product of force and the perpendicular distance between the pivot and line of force. He considered providing a force greater than the weight of the tree, but this is only feasible if the force...  moreMr. Andy chimed in with the idea of momentum. Momentum is the product of force and the perpendicular distance between the pivot and line of force. He considered providing a force greater than the weight of the tree, but this is only feasible if the force is delivered on the other side of the root.
    It is a fact that when a force is applied far from the pivot, the force is sufficient to elevate the other force/weight. Mr. Andy used that notion when assisting the individual.  

    • July 15, 2021
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    Farhan Shahid Andy's idea concerns the effect of moments. The idea about moments is that the further a force acts away from the pivot(the turning point of an object), the more effective it will be in turning the object. For example, the knob of a door is situated the...  moreAndy's idea concerns the effect of moments. The idea about moments is that the further a force acts away from the pivot(the turning point of an object), the more effective it will be in turning the object. For example, the knob of a door is situated the farthest from its pivot, the hinges. In the picture, we can see that the tree is tilted down towards the side of its roots. From this, we can guess that(counting the car as a pivot) there is a greater load acting downwards in that side of the tree, than the side with the leaves. The way the people were doing it before, they were wasting strength overcoming all the those forces and uprooting the tree. They were using the car as a pivot, and the distance between their force and the car/pivot was not much. However, pushing in an anticlockwise direction on the other side, with the leaves, shifts the pivot from being the car to being the roots, all the way on the other side of the tree. The pivot being far away, the forces proved effective.  less

    • July 15, 2021
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    Abdullah Masud Mr Andy was able to use the principles of moment in the above scenario. As mentioned in the scenario, the roots of the tree were fixed with the ground so it was a fixed point and a fixed point is called a pivot. This pivot allowed the tree to be removed...  moreMr Andy was able to use the principles of moment in the above scenario. As mentioned in the scenario, the roots of the tree were fixed with the ground so it was a fixed point and a fixed point is called a pivot. This pivot allowed the tree to be removed over the car. According to the principles of moment, the distance from the pivot to the point where the force is applied is directly proportional to the moment, meaning the longer this distance, the greater the rotation of the tree and that is why Mr Andy applied his force on the farther end of the tree so that with less force would produce greater moment due to the longer distance, away from the tree and was successful to remove it and save the passenger.  less

    • July 15, 2021
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    Shaikh Nafisa Binte Fahad Andy told others to help lift the tree from the other side, as the force acting away from the root of the tree made it easier to lift the tree than near the root.
    The car was acting as a pivot here because the weight of the whole tree was on the car. The...  moreAndy told others to help lift the tree from the other side, as the force acting away from the root of the tree made it easier to lift the tree than near the root.
    The car was acting as a pivot here because the weight of the whole tree was on the car. The bottom side of the tree was not uprooted, so it was heavier than the upper part, so more force was needed to lift it from near the roots. Therefore, it was easier to lift the tree upwards at a certain distance away from the root of the tree as there was less weight in the upper direction.
    Today, we learned about a great example in the field of physics. this topic can be identified as the 'moments'. Moments are directly proportional to the force and distance of a body, just like this one! Easy-Peasy!  less

    • July 16, 2021
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    Raheeb Arman Andy uses the idea of moment. Moment of a force is a measure of its tendency to cause a body to rotate on a pivot. Moment justifies that closer you are to the pivot, more force is required to move the object. This law is obeyed by many objects which we...  moreAndy uses the idea of moment. Moment of a force is a measure of its tendency to cause a body to rotate on a pivot. Moment justifies that closer you are to the pivot, more force is required to move the object. This law is obeyed by many objects which we use in our daily life. For example, if we use a nut-cracker the more the distance is, the less force is required. The less the distance is, the more force is required. Similarly, in this case the pivot is the root of the tree which is the turning point. The crowd tried to lift the tree by going closer to the pivot but they were doing it wrong as the tree is not fully uprooted. But, Andy did it in a correct way because the distance was more from the pivot which made it easier to move the tree which ultimately helped to save the person. In simpler words, if we sum up, the more the distance from the pivot the less force is required and the less the distance from the pivot the more force is required to lift the body which is demonstrated in this scenario.  less

    • July 16, 2021
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  Andy Morales and The Rain - $5 Physics Quiz

  Andy Morales and the Rain - $5 Physics Quiz
   
  It's 6p.m, time to leave the railway station - Andy thought to himself, with a big sigh. Living a lonely life since the demise of his wife two years ago, everything to him seemed monotonous and tedious....

  • July 12, 2021

  • Hasnain Tariq likes this.
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    Hasnain Tariq Andy Morales follow the rule of moment arm. moment arm is the perpendicular distance b/w line of action and axis of rotation. In this case we will consider roots as an axis and other part is line of action . According to this rule if Andy Morales apply...  moreAndy Morales follow the rule of moment arm. moment arm is the perpendicular distance b/w line of action and axis of rotation. In this case we will consider roots as an axis and other part is line of action . According to this rule if Andy Morales apply force at axis of rotation . Tree will never move because moment arm is zero but they applied force at other end so tree move away easily  

    • July 12, 2021
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    Zarin sadaf snigdha Here Andy is following the laws of Moment. Here the roots are the axis of rotation & the tree is the line of action. If Andy applies force on the axis of rotation the tree will never move as it is the pivot point & Moment will be zero. But if he...  moreHere Andy is following the laws of Moment. Here the roots are the axis of rotation & the tree is the line of action. If Andy applies force on the axis of rotation the tree will never move as it is the pivot point & Moment will be zero. But if he applies force on the other side it will be on the line of action & this Moment will be maximum & the tree can be moved easily as it is at the point of tipping over due to the weight of the roots.  

    • July 12, 2021
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    Shadman Chowdhury The answer to this question is quite simple and straightforward. The force exerted (Trying to lift the tree) was, Tension force of rope=Tension force at a certain distance from the End of the rope= Force that would be required to push (lift) the car...  moreThe answer to this question is quite simple and straightforward. The force exerted (Trying to lift the tree) was, Tension force of rope=Tension force at a certain distance from the End of the rope= Force that would be required to push (lift) the car upwards if it were not attached to anything else.
    
    In physics it's called as- "The Loewy Effect"
    
    Now, when he went near the tree, it was easier to push upwards on car since it's a force acting in the opposite direction of his weight. AND thus, when Andy started pushing upwards, he seemed to be lifting it up instead of just pushing it up
    
    So, he was applying force on the car in such way that it seems like car is being lifted up. By pushing upwards at a certain distance from the root of tree, there was no weight (applied) in opposite direction and thus moving towards applied force gives him more effect than when pushing downwards.
    
    Thus, the force to lift the car was directly proportional to distance from tree's roots.  less

    • July 13, 2021
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    Tanveer Tausif Ratul Andy actually used the theory called-MOMENT.So the question is what is moment?Moment is the measure of the ability of a force to produce rotation/turning effect of an object about a fixed point or an axis.It can be measured by a simple formula which is...  moreAndy actually used the theory called-MOMENT.So the question is what is moment?Moment is the measure of the ability of a force to produce rotation/turning effect of an object about a fixed point or an axis.It can be measured by a simple formula which is M=r*F,where F is the applied force on that body, r is the perpendicular distance of the force from the center & M is the moment which will be produced for that force.From the equation,it can be said that,if the applied force is constant,then moment is proportional to the distance between center of the body and applied force.So,if the force is applied near the center point,the moment will be smaller which means it will be difficult to rotate that body.On the other hand,if the force is applied far from the center,the moment will be bigger which means it will be easier to rotate that object about the same center point.
    
    
    Now I will describe it using Andy’s phenomena.In that criteria the root of the tree was the center point mentioned above.Imagine those...    less

    • July 13, 2021
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    Tanveer Tausif Ratul people were applying 10N force.
    
    
    So when they were trying to uproot the tree from the bottom side,which means the applied force was near...  morepeople were applying 10N force.
    
    
    So when they were trying to uproot the tree from the bottom side,which means the applied force was near the
    center point(the root).As a result the moment became smaller and for that,it became very difficult to move the tree.But when Andy applied that same 10N force at the other side of the tree,the distance between the root and the force became much bigger.Then the moment was bigger than the previous one.So,it became easier to move the tree then.
    
    
    So the whole concept was about
    Moment of a force.  less

    • July 13, 2021
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    Hasnain Tariq hi Tanveer how you can assume that they need 10 N force to move the tree away . did you know 10 N is actually required to displace mass of 1.02 kg and i think mass of tree is much higher

    • July 14, 2021
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    Rohan Deb Because of Laws of Moment it was easier to lift the tree away from it roots. We have to apply Total Anticlockwise Moment=Total Clockwise Moment. Suppose the roots of the tree has a moment of 25N/m after falling onto the car. So in order to lift the tree...  moreBecause of Laws of Moment it was easier to lift the tree away from it roots. We have to apply Total Anticlockwise Moment=Total Clockwise Moment. Suppose the roots of the tree has a moment of 25N/m after falling onto the car. So in order to lift the tree from the car the same 25N/m of moment should be applied to the force acting away from the tree's roots.  

    • July 14, 2021
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    Moneera Chowdhury To push the tree up, you have to give a force that is bigger than the tree's weight. At a distance further from the roots, the distance you have to move the tree from the ground to upright is bigger than the distance closer to the roots. To make up for...  moreTo push the tree up, you have to give a force that is bigger than the tree's weight. At a distance further from the roots, the distance you have to move the tree from the ground to upright is bigger than the distance closer to the roots. To make up for the short distance, you have to give a powerful force, which makes it harder to push the tree up. The weight of the tree is spread out across the distance, a longer distance means the weight is more spread out, making it easier to lift the tree.  

    • July 15, 2021
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    • 1 likes this
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    Wafeeqa Hoque Mr. Morales implemented the concept of ‘moment’. Moment can be defined as the turning effect of a force around a pivot by the perpendicular/ at right angle distance between the pivot and force applied.
    -Pivot: Is the fixed point over which...  moreMr. Morales implemented the concept of ‘moment’. Moment can be defined as the turning effect of a force around a pivot by the perpendicular/ at right angle distance between the pivot and force applied.
    -Pivot: Is the fixed point over which something can turn or move about. For ex. In a wheelbarrow, the wheel will be the pivot.
    -Turning effect of force applied: This is simply the turning of the object about the pivot. For ex. A spanner being turned about a bolt (pivot) to tighten or loosen it.
    Here, the tree’s roots were still embedded in the ground and we know that fixed point forms the pivot. So if the roots are firmly in the ground, it won’t be possible to uproot the tree from the bottom end(roots’ side). If they tried lifting the tree over a short distance from the pivot, this would give the less efficient moment and would need a hefty amount of force. However, if the tree was lifted from the other end, force required is less and gives the proper result. This is basically because the...    less

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    Wafeeqa Hoque ...
    This is basically because the farther you are from the pivot, the lesser force required.

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    Abeer Muhammad Andy used what is called the turning effect of a force, also
    called the moment of a force. To understand this, we need to know a couple of
    things:...  moreAndy used what is called the turning effect of a force, also
    called the moment of a force. To understand this, we need to know a couple of
    things:
    
    
    a.
    There is a pivot (i.e. the point at which the
    object rotates)
    
    
    b.
    The effect of a force is greatest at the furthest
    distance possible from the pivot
    
    
    What the people there were doing wrong was that they were
    trying to lift the tree from near the pivot. However, the tree hadn’t
    completely uprooted and had little effect upon lifting the tree. Andy’s
    instincts told him to lift the tree at the furthest end from the pivot, meaning
    that the effect of the force will be at its peak. In doing so, they were able
    to save the person inside the car.  less

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    Arika Afrin Greater distance from the pivot, less force is required so in this case, the pivot is the root of the tree and if you are close to the pivot which is the root then it will require more force or it will be impossible to lift it up and Mr. Morales went to...  moreGreater distance from the pivot, less force is required so in this case, the pivot is the root of the tree and if you are close to the pivot which is the root then it will require more force or it will be impossible to lift it up and Mr. Morales went to the other side of the tree so away from the pivot so it required less force to lift it up.  

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    Jawadul Islam Chowdhury Imagine a wrench tightly fitted onto a nut. If you were to move the wrench from the head, a lot of energy would be required to do that. However, if you were to move the wrench from the head side, a lot less energy would be needed to move the wrench. The...  moreImagine a wrench tightly fitted onto a nut. If you were to move the wrench from the head, a lot of energy would be required to do that. However, if you were to move the wrench from the head side, a lot less energy would be needed to move the wrench. The same logic applies to the tree  

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    Syeda Anmol Andy used the ideology of moment. Moment of force is the idea to make a body to rotate on a pivot. Moment has a simple rule that is the closer you are to the pivot or the point the more energy you would require to rotate the body. This rule is obeyed by...  moreAndy used the ideology of moment. Moment of force is the idea to make a body to rotate on a pivot. Moment has a simple rule that is the closer you are to the pivot or the point the more energy you would require to rotate the body. This rule is obeyed by many objects which we use in our day-to-day life. Like a spanner handle is placed far from the pivot to rotate the nut or nail easier with less force. Similarly, in this case the pivot is the root of the tree, it is the turning point for the tree, when the crowd gathered they applied force very close to the pivot or the root this cause the tree not to budge but when Andy positioned the force on the far end from the pivot it made it easier for the crowd to move the tree. In simple, we can sum it up that the greater the distance the less the force needed and the smaller the distance the more force is needed which this scenario perfectly portrayed.  less

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    Nishat Tamanna Mr. Andy chimed in with the idea of momentum. Momentum is the product of force and the perpendicular distance between the pivot and line of force. He considered providing a force greater than the weight of the tree, but this is only feasible if the force...  moreMr. Andy chimed in with the idea of momentum. Momentum is the product of force and the perpendicular distance between the pivot and line of force. He considered providing a force greater than the weight of the tree, but this is only feasible if the force is delivered on the other side of the root.
    It is a fact that when a force is applied far from the pivot, the force is sufficient to elevate the other force/weight. Mr. Andy used that notion when assisting the individual.  

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    Farhan Shahid Andy's idea concerns the effect of moments. The idea about moments is that the further a force acts away from the pivot(the turning point of an object), the more effective it will be in turning the object. For example, the knob of a door is situated the...  moreAndy's idea concerns the effect of moments. The idea about moments is that the further a force acts away from the pivot(the turning point of an object), the more effective it will be in turning the object. For example, the knob of a door is situated the farthest from its pivot, the hinges. In the picture, we can see that the tree is tilted down towards the side of its roots. From this, we can guess that(counting the car as a pivot) there is a greater load acting downwards in that side of the tree, than the side with the leaves. The way the people were doing it before, they were wasting strength overcoming all the those forces and uprooting the tree. They were using the car as a pivot, and the distance between their force and the car/pivot was not much. However, pushing in an anticlockwise direction on the other side, with the leaves, shifts the pivot from being the car to being the roots, all the way on the other side of the tree. The pivot being far away, the forces proved effective.  less

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    Abdullah Masud Mr Andy was able to use the principles of moment in the above scenario. As mentioned in the scenario, the roots of the tree were fixed with the ground so it was a fixed point and a fixed point is called a pivot. This pivot allowed the tree to be removed...  moreMr Andy was able to use the principles of moment in the above scenario. As mentioned in the scenario, the roots of the tree were fixed with the ground so it was a fixed point and a fixed point is called a pivot. This pivot allowed the tree to be removed over the car. According to the principles of moment, the distance from the pivot to the point where the force is applied is directly proportional to the moment, meaning the longer this distance, the greater the rotation of the tree and that is why Mr Andy applied his force on the farther end of the tree so that with less force would produce greater moment due to the longer distance, away from the tree and was successful to remove it and save the passenger.  less

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    Shaikh Nafisa Binte Fahad Andy told others to help lift the tree from the other side, as the force acting away from the root of the tree made it easier to lift the tree than near the root.
    The car was acting as a pivot here because the weight of the whole tree was on the car. The...  moreAndy told others to help lift the tree from the other side, as the force acting away from the root of the tree made it easier to lift the tree than near the root.
    The car was acting as a pivot here because the weight of the whole tree was on the car. The bottom side of the tree was not uprooted, so it was heavier than the upper part, so more force was needed to lift it from near the roots. Therefore, it was easier to lift the tree upwards at a certain distance away from the root of the tree as there was less weight in the upper direction.
    Today, we learned about a great example in the field of physics. this topic can be identified as the 'moments'. Moments are directly proportional to the force and distance of a body, just like this one! Easy-Peasy!  less

    • July 16, 2021
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    Raheeb Arman Andy uses the idea of moment. Moment of a force is a measure of its tendency to cause a body to rotate on a pivot. Moment justifies that closer you are to the pivot, more force is required to move the object. This law is obeyed by many objects which we...  moreAndy uses the idea of moment. Moment of a force is a measure of its tendency to cause a body to rotate on a pivot. Moment justifies that closer you are to the pivot, more force is required to move the object. This law is obeyed by many objects which we use in our daily life. For example, if we use a nut-cracker the more the distance is, the less force is required. The less the distance is, the more force is required. Similarly, in this case the pivot is the root of the tree which is the turning point. The crowd tried to lift the tree by going closer to the pivot but they were doing it wrong as the tree is not fully uprooted. But, Andy did it in a correct way because the distance was more from the pivot which made it easier to move the tree which ultimately helped to save the person. In simpler words, if we sum up, the more the distance from the pivot the less force is required and the less the distance from the pivot the more force is required to lift the body which is demonstrated in this scenario.  less

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