Put a one-rupee coin over a piece of card paper placed on an empty glass. Push the card with a sudden stroke of a finger. The card will move ahead while the coin falls into the glass. Why it does do?

Question

Put a one-rupee coin over a piece of card paper placed on an empty glass. Push the card with a sudden stroke of a finger. The card will move ahead while the coin falls into the glass. Why it does do?

Accepted Answer

Due to inertia card will continue its motion in the forward direction while the coin will remain at rest and will fall into the glass.