Question

two balls of the same size but of different materials rubber and iron are kept on the smooth floor of a moving train. The Brakers are applied suddenly to stop the train.Will the ball start rolling? If so in which direction? Will they move with the same speed? Give reason for your answer.

Answer 1

When the train is stopped suddenly, then it comes in the state of rest but the balls remain in the state of motion. So, due to inertia of motion, the balls move in the forward direction.As the balls are of same size but of different materials that means their mass will be different. So, both the balls will move with different speeds!!

Answer 2

in same direction in which train is moving but the speed will be different because rubber increases the friction