Question

Give reasons:
(A) A karate player suddenly reduces the speed of his hand while hitting a ice slab .
(b) Glass ware are covered with paper and straw while transportation.

Answer 1

(A)The karate player strikes the slab of ice as fast as possible with his or her hand. In doing so, the entire momentum of the hand is reduced to zero in a very short time. As a result, the force delivered on the pile of tiles or a slab of ice is large enough to break it.

(B)The glassware is wrapped with straw especially during transportation. This is important in reducing the force at which the glasses knock each other. Since the straws have a softer surface, the rate of change in momentum is thus lowered in case of bumps and hence the force generated is low. This ensures that the glassware do not break while being transported.