What is a roller coaster?
A roller coaster car is a mechanism that uses gravity and inertia to send a car on a winding track (i-e, track with a number of hills, bottoms and curves). Due to gravity and inertia, energy of the car is continuously exchanged between gravitational potential energy and kinetic energy and the car moves.
Initially, the car is moved to the top of the hill (hill is a place of high elevation on the track of the car) with the help of a chain. Here the car has some P.E due to its elevated location. This energy is converted to K.E as the car moves down from the hill to the bottom on the track. The speedily moving car at the bottom moves up on another (second) hill where it gains P.E once again. That energy is converted to the K.E as the car comes down from the hill to the bottom. Here it goes up a third hill and the process goes on.
If the track consists of turns, friction between the wheels of the car and track is utilized to provide the necessary centripetal force for the curve.
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