Question

In Fig. 3.17, a block of weight 15 N is hanging from a rigid support by a string. What force is exerted by

(a) block on the string,
(b) string on the block?
Name them and show them in the diagram.

Answer 1

(a) A block exerts 15 N force (weight) on the string downwards.
(b) The string exerts an equal force of 15 N on the block in the opposite direction, i.e. upward direction (tension).