Question

why does arm move in circular motion​

Answer 1

Answer:

For example, when someone spins a ball attached to a rope horizontally above his head, the rope transmits a centripetal force from the muscles of the hand and arm, causing the ball to move in a circular path. Centripetal forces cause centripetal accelerations.

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Answer 2

Answer:

For example, when someone spins a ball attached to a rope horizontally above his head, the rope transmits a centripetal force from the muscles of the hand and arm, causing the ball to move in a circular path. Centripetal forces cause centripetal accelerations