Unit - 3.1 Energy And Work And Their Units. — PHYSICS STD 7 — Question

(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.