Two balls of the same size but of different materials, rubber and iron are kept on the smooth floor of a moving train. The brakes 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 reasons for your answer.

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Solution

Explanation.
Yes, the ball will begin to move in the same direction as the train was traveling.
The train comes to a halt when the brakes are applied, but the balls remain in motion due to inertia and begin to roll.
Because the masses of the balls are not equal, the inertial forces on both balls are not equal.
As a result, the balls will move at various speeds.

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