On a roller coaster, the primary forces at play are gravity and the track. Gravity pulls the coaster down the track, causing it to accelerate. The track also exerts forces on the coaster, such as friction and centrifugal force. Friction opposes the motion of the coaster, causing it to slow down. Centrifugal force pushes the coaster outward from the center of the curve, keeping it on the track.
The acceleration of a roller coaster can be quite significant. Some coasters can reach speeds of over 100 miles per hour, and they can experience accelerations of several times the force of gravity. This can make for a thrilling ride, but it can also be dangerous. Roller coaster accidents can occur if the forces on the coaster are too great, or if the coaster is not properly designed and maintained.