A Coin Is Placed on a Horizontal Phonograph Turntable

question 7

Multiple Choice

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 f_{s, 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 f_{s, max} stays the same
• B)N increases, f increases, and f_{s, max} increases
• C)f increases and both N and f_{s, max} stay the same
• D)N, f, and f_{s, max} all stay the same
• E)N, f, and f_{s, max} all increase

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