Coin-Card-Cup Trick
Coin drops straight into cup.
Teaching & key ideas
What you do: Set coin on card over cup and flick card sideways.
What students see: Coin drops straight into cup.
Why it works: The coin tends to stay at rest while the card moves away.
Question to ask: Why didn't the coin fly sideways?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Why didn't the coin fly sideways?