Question

Two balls of the same size but one made of iron and one made of wood are kept on the smooth floor of moving train. The brakes are applied suddenly to stop the moving train. a)Will the balls start rolling? If they move so , in which direction do they move? Give scientific reason for your answer. b)Will they move with same speed? Why?

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.