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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G Prasad

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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

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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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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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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PCM Teacher

Although no work is done in pushing a wall since there is no displacement but action reaction forces are playing their role, action we are exerting on wall and reaction is being exerted on us by wall and this causes tiredness
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Mathematics Expert

Reason behind tiredness is heat generated!!!!
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When you push the wall, due to having displacement zero, work done= force*displacement = 0; but force is not zero. You have applied force so.
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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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