12.3c Example 2: Rollercoaster Loops | A2 Circular Motion | Cambridge A Level 9702 Physics

This diagram shows part of the track of a roller-coaster ride in which a truck loops the loop. When the truck is at the position shown, there is no reaction force between the wheels of the truck and the track. The diameter of the loop in the track is 8.0 m.
(a) Explain what provides the centripetal force to keep the truck moving in a circle. [1]
(b) Given that the acceleration due to gravity g is 9.81 ms-1, calculate the speed of the truck. [3]

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