Eli5: An inertia demonstration experiment tells that: “A coin is placed on a smooth card which serves as a lid on a glass. When the card is pulled suddenly in the horizontal direction the coin falls into the glass.” But when we pull the card slowly and gradually, the coin will go with card. Why?

Question

Eli5: An inertia demonstration experiment tells that: “A coin is placed on a smooth card which serves as a lid on a glass. When the card is pulled suddenly in the horizontal direction the coin falls into the glass.” But when we pull the card slowly and gradually, the coin will go with card. Why?

In: 0

Answer 1

Real answer: Frictional transfer rate not being high enough to keep up. the coin *does* go with the card in both instances, it just slides off in the second example.

True answer: physics update times, if you move an object fast enough there’s clipping issues.