A coin sits at rest on a turntable. The coin is then moved to different location

Question

A coin sits at rest on a turntable. The coin is then moved to different locations on the flat turntable further from the center of the turntable. Assume that the turntable rotates at exactly the same rate for every location that one places the coin and that the coin is stationary on the turntable at each of the locations. Which of the following statements about the coin on the turntable is correct?

1) The normal force on the coin from the turntable increases as the distance from the center of the turntable increases, but the friction force on the coin from the turntable decreases as the distance from the center increases. 2) The normal force on the coin from the turntable is the same at all locations, but the friction force decreases the further the coin is from the center of the turntable. 3) The normal force on the coin from the turntable is the same at all locations, but the friction force on the coin increases the further the coin is from the center of the turntable. 4) The normal force on the coin from the turntable is the same at all locations, and the friction force on the coinis the same at all distancesfrom the center of the turntable. 5) The normal force on the coin from the turntable increases as the distance from the center of the turntable increases, as does the friction force acting on the coin from the turntable.

Explanation / Answer

2) The normal force on the coin from the turntable is the same at all locations, but the friction force decreases the further the coin is from the center of the turntable.

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