Coin-Card-Cup Trick

Coin drops straight into cup. Ask students to predict what will happen. Set coin on card over cup and flick card sideways. Key idea: The coin tends to stay at rest while the card moves away. Ask: Why didn't the coin fly sideways? Safety and cleanup: Use plastic cup. https://www.auburn.edu/academic/cosam/departments/physics/intro-courses/demonstrations/mechanics/newton-1st/