Question

a. State Newton's third law of motion.
b. If someone jumps from a boat on to the shore, the boat moves in the opposite direction. Explain.
c. When the air from an inflated balloon is allowed to be released, the balloon moves in a direction opposite to that of air. Explain.

CBSE Class IX Science SA 2 (3 Marks)

Answer 1

(a) Newton's Third Law of Motion : To every action, there is always an equal and opposite reaction.

(b) The boat moves in the backward direction when the person jumps from it in the forward direction, and in turn, the boat also exerts an equal force in the forward direction on the man.

Force applied by the man on boat - action.

Force applied by the boat on man - reaction; which are always equal.

Walls of stretched balloon exert a force on air to push it out; air applies a force in the opposite direction.