Question

A boy pushes the wall,the wall dosen't moves.What happens to the energy that he applied?Where does the energy goes?Even the work done is zero

Answer 1

We know that

3)Work = Force × displacement

Let's think the boy is applying X N force

Now,Work =X × 0

[the displacement doesn't happen.]

So the work = 0

1) Pushing a wall means the boy is applying force.

Now

Energy = Force × Displacement

Here the displacement is 0

So it means Energy is 0

You didn't transfer any energy to the wall.


2)The energy turns into heat,then the heat is transferred into the blood.


Hope it helps.

Answer 2

bcoz sometimes the effect of force is not applicable as on the wall it is not applicable.the energy which is applied is wasted.