Question

Pick the situation(s) from the following in which there is no work done.

• A. A horse pulling a cart
• B. A cyclist pedalling a cycle
• C. A man pushing a wall
• D. A coolie standing with a heavy load on his head

Answer 1

Answer: (C), (D)

The correct options are
C A man pushing a wall
D A coolie standing with a heavy load on his head

In physics, work is done when a force produces motion. Therefore, a horse while pulling a cart and a cyclist while pedalling a cycle do work, as motion occur in these situations. However, a man pushing a wall and a coolie standing with a heavy load on his head scientifically do no work as they produce no motion.