Imagine you are at Disneyland on a big roller coaster, sitting with a friend in the front seat of the cart. You ride slowly up to the top of the first hill, then stop momentarily before descending. What force is acting on you? What will happen next to you (and your mass, and the cart’s mass) as a result of this force?

Imagine you are at Disneyland on a big roller coaster, sitting with a friend in the front seat of the cart. You ride slowly up to the top of the first hill, then stop momentarily before descending. What force is acting on you? What will happen next to you (and your mass, and the cart’s mass) as a result of this force?