Question

Why is a porter carrying a load on his load, but standing in one place, does not work?

Answer 1

1. Work done is mathematically defined as the product of force and displacement.
   $Workdone=Forceapplied\times Displacement$
2. For work to be done, a force must be exerted and there must be motion or displacement in the direction of the force.
3. If force displaces a body then work has been done, If force does not displace then the work done is zero.
4. Porter is holding a load by applied force but there is no displacement, Hence work done by porter is zero.