Have you ever ridden a roller coaster? They often have numerous dips and turns and some even have loops. These turns that a rider experiences all involve circular motion and centripetal force. But how is this possible if a roller coaster rarely, if ever, moves in a perfect circle?
Centripetal force and circular motion occur instantaneously while the car is in motion. In the middle of a curve, the rider is experiencing instantaneous centripetal force as he travels along the arc of a larger circle.
1) How would centripetal force work differently on a hill or dip than a curve?
2) What other forces act on the roller coaster? In what ways?
3) WIthout the use of handles, bars, or seatbelts, how could riders stay in their seats when going over a loop?