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Class 10 > Learn Class IX-X Tuition > In Pushing a wall no work is being done. Then what...
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In Pushing a wall no work is being done. Then what is the reason behind tiredness? Explain in terms of physics...

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Tiredness is a function of energy dissipation, which may occur through various forms. Only one form of this is work. In the case of pushing a wall we are constantly supplying energy which makes us tired. It would also happen if you just sit on a chair for the whole day. The answer to this energy flow...
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Tiredness is a function of energy dissipation, which may occur through various forms. Only one form of this is work. In the case of pushing a wall we are constantly supplying energy which makes us tired. It would also happen if you just sit on a chair for the whole day. The answer to this energy flow lies in one of the most simple experiments of stretching a rubber-band, of course without breaking it. Let us see this phenomenon much more closely. Take a normal rubber-band and stretch it with your fingers. Does it move anywhere? The answer is NO. It simply gets elongated. Now, if you have pulled only slightly, on releasing your fingers, it returns to its original shape. We call it elastic change of shape [formally called as elastic deformation]. And the energy associated with this is called elastic energy. If you had pulled a bit more, it would be a bit more elongated than what it was before. We call this plastic change in shape [deformation]. [Note:- There are further kinds of deformation but currently we shall restrict ourselves to these.] But has it moved from its original position? NO. So, if you were to hold a rubber-band, in stretched position for the whole day what you are doing is providing this elastic energy to the rubber-band. This was elastic energy in tension. Let us see an example of elastic energy in compression. Take a simple eraser in your hand and press it between your fingers. Now it is compressional elastic energy, which you are continuously supplying to it. Let us come to our wall pushing experiment. Here there are many erasers and rubber-bands that are getting compressed and pulled away. 1 The wall is getting compressed. Even if you can't see, the molecules in the wall are deformed. 2 Your own skin on the palms. 3 Your finger bones. Yes they too are elastic due to their porosity [of course within limits] 4 If you are not wearing your shoes and the skin of feet against the floor. 5 The irregularities of floor surface which we see as friction. 6 Countless tiny ligaments and muscles which get pulled. These are based on physics. More than this there are many biological reasons as well, in terms of ATP [Adenosine Triphosphate- the chemical for intracellular energy transfer] metabolism, which causes change in blood pressure, thus again leading to consumption of energy. read less
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B Tech ( NIT Jamshedpur)

Internal work is being done by muscle cell, so we loose energy, where as in particle physics, work done by a force can only be said when that force displaces the body (in the direction of force applied )on which it is applied.
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Tutor

When you push the wall, you're actually tensing up your muscles against that wall. Even though the wall doesn't move, your muscles still do, and that tensing of your muscles is where the energy is used.
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Doing work is a path function and is always done if the body travels some distance. Expanding energy is different term. You should not get confused between work ad energy. Work and heat both are forms of energy. If there is no work in a process but still there is energy expanding, then obviously there...
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Doing work is a path function and is always done if the body travels some distance. Expanding energy is different term. You should not get confused between work ad energy. Work and heat both are forms of energy. If there is no work in a process but still there is energy expanding, then obviously there must be heat output. This is in fact an in depth topic of thermodynamics. While pushing the wall there is no work done as displacement is zero, but there will be heat output. And tiredness comes because of the internal stress created causing the muscles to react to the action of pushing and fatigue. read less
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Teaching is my passion!!!!

W =F.S.....SINCE DISPLACEMENT S IS 0...SO W =0
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Friendly & Energetic Teacher

Work is said to be done if after application of force there is a displacement in the initial position of object and here the wall is not moving. So,work is not said to be done. Reason behind tiredness is because we are applying force on the wall and due to this loosing our energy continuously.
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B.Tech, Spoken English, EEC, MATLAB, CET Coaching Tutor with 20 years of experience

In physics, work is a very specific term and has a more specific meaning than its everyday meaning, So even though pushing on a wall can be quit exhausting, in terms of the physical definition for work, you are not doing work, because nothing is moving or changing position. there are 3 conditions...
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In physics, work is a very specific term and has a more specific meaning than its everyday meaning, So even though pushing on a wall can be quit exhausting, in terms of the physical definition for work, you are not doing work, because nothing is moving or changing position. there are 3 conditions for work to be done on an object: 1) there must be movement, so pushing on a wall with 100N of force is not doing any work on the wall, because the wall is not moving. 2) there must be a force, a person riding a bike that is coasting, is not doing any work on the bike because even though there is movement, a person is not applying a horizontal force to the bike. 3) the force and the distance the object travels must be in the same direction, a person is not doing any work on a backpack, when they are carrying it parallel to the ground, because the force of their hand on the pack is vertical, while the distance the pack travels is horizontal. Even though we are doing "work" trying to push the wall and it becomes tiring, in a physical definition there is no movement, because there is no "work" being done. read less
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Experienced Mathematicians teacher, also can take other subjects based on requirements

As we know that work is equal to energy ( the unit for work and energy is Joule). W=Fs ; W- work done F- Force applied s- displacement for example: when we push a wall, the s is zaro. thus, W=Fs =F X 0 = 0 Joule. so, no work is done. but from the theory, work is equal to energy. So it...
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As we know that work is equal to energy ( the unit for work and energy is Joule). W=Fs ; W- work done F- Force applied s- displacement for example: when we push a wall, the s is zaro. thus, W=Fs =F X 0 = 0 Joule. so, no work is done. but from the theory, work is equal to energy. So it can be concluded that no energy is transferred. So even though pushing on a wall can be quit exhausting, in terms of the physical definition for work, you are not doing work, because nothing is moving or changing position. you are exerting a FORCE into the wall, but that force is counteracted by an opposing NORMAL FORCE the wall exerts on you which is made of the electro static attraction all the particles in the wall have for each other. read less
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"MAKES U SCORE 100/100"

While pushing a wall ,equal amount of pushback from the wall and there is no change in terms of displacement. Thereby as per physics , there is now work done,whereas for putting /exerting the force on wall, we need energy to get it done and hence ATP is consumed .This is the reason behind tiredness.
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Chemistry Wizard/English Expert

Undoubtedly, you have been taught that "Work equals force times distance." Brace yourself. Work is sometimes force times distance, but not always. Work is more subtle than that, and in order to understand energy, you have to understand work to a greater depth. If you think that "work equals force...
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Undoubtedly, you have been taught that "Work equals force times distance." Brace yourself. Work is sometimes force times distance, but not always. Work is more subtle than that, and in order to understand energy, you have to understand work to a greater depth. If you think that "work equals force times distance," then you probably think that you automatically do work every time you exert a force. That's not true, either! Why? Well, the work/energy equation says that work done (by the net force on an object) equals the object's change in kinetic energy. More simply: Work = Change in Kinetic Energy This means that if an object's kinetic energy doesn't change, then no work has been done on the object - whether or not a force has been exerted Now, remember that forces cause accelerations (Newton's Second Law), but an object can accelerate by speeding up, in which case the object's kinetic energy increases, slowing down, in which case the object's kinetic energy decreases, or changing direction, in which case the object's kinetic energy does not change. So, an object's kinetic energy will only change if the force acting on the object changes the object's speed. This will only happen if there is a component of the force in the direction that the object moves. Therefore, a force will do work only if the force has a component in the direction that the object moves. read less
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