Why does a coin, placed on a card, drop into the tumbler when the card is rapidly flicked with a finger?

Explanation

A coin, placed on a card, drop into the tumbler when the card is rapidly flicked with a finger due to inertia of rest of the coin.
When the card was at rest on the tumbler, the coin was also at rest. When the card is flicked, a momentary force acts on the card, so it moves away. But the coin remains stationary due to its inertia of rest and falls down into the tumbler due to the pull of gravity.