The document discusses concepts related to circular motion including:
1) A ball attached to a string moving in a circular path will follow a straight line path if the string breaks at a given instant.
2) There is a net force on a car rounding a curve due to centripetal acceleration which depends on the sharpness of the curve and speed of the car.
3) On a merry-go-round, someone sitting halfway between the center and edge will have half the linear speed but the same rotational speed as someone on the very edge.
2. Concept A B C v A ball is going around in a circle attached to a string. If the string breaks at the instant shown, which path will the ball follow?
