Ram tried hard to push the wall of a room. In the process of pushing the wall, he begins to perspire and feels exhausted although the wall does not move. Ram feels that he has done a lot of work and spent a lot of energy.
Q. Ram tried hard to push the wall of a room. In the process of pushing the wall, he begins to perspire and feels exhausted although the wall does not move. Ram feels that he has done a lot of work and spent a lot of energy.
Do you think that Ram was justified in making the statement that he has done a lot of work ? Justify your answer and give the conditions under which work is done.
Ans. Ram is not justified in making the statement that he has done a lot. It should be noted that the condition for a force to do work is that it should produce motion in an object. That is, it should make the object move through some distance. If, however, the distance moved is zero, then the work done ‘on the object’ is always zero. In the question, Ram got completely exhausted in trying to push a stationary wall of the room, but since there is no displacement (the wall does not move), the work done by Ram on the wall is zero.
However, the work done on the body of Ram himself is not zero. This is because when Ram pushes the wall, his muscles are stretched and blood is displaced to the strained muscles more rapidly. These changes consumed energy and Ram got perspired and felt tired.
Follow on Facebook page – Click Here
Google News join in – Click Here
Read More Asia News – Click Here
Read More Sports News – Click Here
Read More Crypto News – Click Here