A small model car with mass m travels at constant speed v on the inside of a track that is a vertical circle with radius 5.00 m. If the normal force exerted by the track on the car when it is at the bottom of the track (point A) is equal to 18.1 kN and at the top of the track (point B) is equal to 2.92 kN, what is the speed v of the car?

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.