A 2 kg particle moves in a vertical circle of radius 2 m. At the highest point its speed is 6 m/s. Take g=10 m/s². If the string tension at the top is N newton, find N.
Physics · Work , Power and Energy · vertical circular motion
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Question

A 2 kg particle moves in a vertical circle of radius 2 m. At the highest point its speed is 6 m/s. Take g=10 m/s². If the string tension at the top is N newton, find N.

G1 Physics · Accepted Answer

At top, T+mg=mv²/R. Thus T=mv²/R−mg = 2×36/2 −20 =36−20=16 N.