Rohan pushes a heavy concrete pillar with a force of $50$ N for 10 minutes until he is exhausted, but the…
Rohan pushes a heavy concrete pillar with a force of $50$ N for 10 minutes until he is exhausted, but the pillar does not move. Neha pushes a light toy cart with a force of $5$ N and moves it by $2$ meters. According to science, who has performed work?
Only Rohan, because he applied much more force and spent energy.
Only Neha, because force caused displacement of the object.
Both Rohan and Neha, because both applied force.
Neither of them, because the objects are very different.
Solution
In science, work is said to be done only when an applied force causes displacement of the object in the direction of the force.