A man is standing on a circular platform which is free to rotate about a fixed vertical axis. If the man starts moving on the periphery of the platform, the COM of the system (man + platform):

Is at the same position as before

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Starts shifting towards periphery

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Starts moving w.r.t. ground.

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None of the above

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Solution

The correct option is C Starts moving w.r.t. ground.
On the whole system there is an external resultant force applied by fixed vertical axis, so centre of mass of the whole system will move with respect to ground.

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A man is standing on a circular platform which is free to rotate about a fixed vertical axis. If the man starts moving on the periphery of the platform, the COM of the system (man + platform):

The correct option is C Starts moving w.r.t. ground.On the whole system there is an external resultant force applied by fixed vertical axis, so centre of mass of the whole system will move with respect to ground.

The correct option is C Starts moving w.r.t. ground.
On the whole system there is an external resultant force applied by fixed vertical axis, so centre of mass of the whole system will move with respect to ground.