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Why will the coin fall into the glass when the index card is quckly pulled out?
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Why will the coin fall into the glass when the index card is quckly pulled out?

Why will the coin fall into the glass when the index card is quckly pulled out?-example-1
User Mohit Tyagi
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4 votes

The coin has inertia, meaning it really wants to stay in one place. If you move the card slowly, it isn't fast enough to overcome that force. If you flick it quickly, the coin stays in one place and then drops into the cup.

User Mark Kelly
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