29. A coin is placed on a horizontal phonograph turntable. Let N be the normal f

Question

29. A coin is placed on a horizontal phonograph turntable. Let N be the normal force exerted by the turntable on the coin, f be the frictional force exerted by the turntable on the coin, and fs, max be the maximum force of the static friction. The speed of the turntable is increased in small steps. If the coin does not slide, then
A) N increases, f increases, and fs, max stays the same
B) N increases, f increases, and fs, max increases
C) f increases and both N and fs, max stay the same
D) N, f, and fs, max all stay the same
E) N, f, and fs, max all increase

Explanation / Answer

option A because when speed increases,centripetal force increases which is provided by frictional force.for frictional force to increase ,normal reaction should increase.but max static friction remains same.

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