Does a child on a merry-go-round revolve or rotate around the merry-go-round’s axis?
To identify:Whether the child on a merry-go-round revolves or rotates around the axis of merry-go-round.
Answer to Problem 2A
The child on a merry-go-round revolves around the axis of merry-go-round.
Explanation of Solution
Introduction:
Consider an object is moving in a circular path about an axis in the interior of object, then the object is said to be rotating about the axis. For example: the rotation of the Earth about its own axis (line passing through the north and south poles of the Earth).
Consider an object is moving in a circular path about an axis in the exterior of object, then the object is said to be revolving about the axis. For example: the revolution of the Earth about the sun.
Consider a child is sitting in a merry-go-round.
The plan view of the merry-go-round is shown below:
The child sits in any of the seat A, B, C, and D .
All the seats are connected to the central pole O .
All the seats will be moving in a circular path about an axis passing through the centre of pole O .
The child sitting in any one of the seats will also move in a circular path about an axis passing through the centre of pole O .
Hence, the child on a merry-go-round revolves around the axis of merry-go-round.
Conclusion:
Thus, the child on a merry-go-round revolves around the axis of merry-go-round.
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