A coin is placed on a horizontal platform, which undergoes horizontal simple harmonic motion about a mean position $O$ .The coin does not slip on the platform. The force of friction acting on the coin is $F$ .

F

is always directed towards

O

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F

is directed towards

O

when the coin is moving away from

O

, and away from

O

when the coin moves towards

O

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F = 0

when the coin and platform come to rest momentarily at the extreme position of the harmonic motion.

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F

is maximum when the coin and platform come to rest momentarily at the extreme position of the harmonic motion.

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Solution

The correct option is A $F$ is always directed towards $O$
Coin does not slip on the platform, its mean that Coin will also execute SHM with same frequency with the platform so, Its acceleration will always act towards the O, hence force will be always towards the O.

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A coin is placed on a horizontal platform, which undergoes horizontal simple harmonic motion about a mean position O.The coin does not slip on the platform. The force of friction acting on the coin is F.

The correct option is A F is always directed towards OCoin does not slip on the platform, its mean that Coin will also execute SHM with same frequency with the platform so, Its acceleration will always act towards the O, hence force will be always towards the O.

A coin is placed on a horizontal platform, which undergoes horizontal simple harmonic motion about a mean position $O$ .The coin does not slip on the platform. The force of friction acting on the coin is $F$ .

The correct option is A $F$ is always directed towards $O$
Coin does not slip on the platform, its mean that Coin will also execute SHM with same frequency with the platform so, Its acceleration will always act towards the O, hence force will be always towards the O.