PHYSICS [3 Mark Question Answer]

(a) The capacity to do work is called Energy.
(b) Mathematically, the concept of work done W equals the force f times the distance (d), that is W = f * d
(c) If you push a wall and it doesn’t move, work is not done as there is no displacement. When we hold a bag on our head and walk horizontally such that the angle between the displacement and the gravitational force is , thus, work done is zero.

(a) It is nothing but a process of energy transfer to an object by applying force. Work is said to be done only if there is a displacement caused due to the force.
(b) The SI unit of work is joule (J). Joule is defined as the work done by a force of one newton causing a displacement of one meter. Sometimes, newton-metre (N-m) is also used for measuring work.
(c) When we talk or think our brain is working means our brain is doing mental work but there is no displacement in this process. Then we can say, there is no energy spent on thinking or talking.