Question

Give reasons for the following :
(a) Road accidents at high speeds are very much worse than accidents at low speeds.
(b) It is easier to stop a tennis ball than a cricket ball moving with the same speed.
(c) A gunman gets a push on firing a bullet.

CBSE Class IX Science SA 2 (3 Marks)

Answer 1

(a) Road accidents at high speeds involve much larger changes in momentum in much smaller time. Therefore, the forces developed are very huge resulting in a disaster.

(b) Tennis ball is lighter than the cricket ball. It has a smaller momentum and hence, smaller force is required to stop the tennis ball.

(c) The gunman gets a je - rk because the gun recoils on firing. This is accounted for by the principle of conservation of momentum.

Answer 2

road accidents at high speed in world much largest changes in momentum in much smaller time. therefore the force developed are very huge resulting in a disaster.