A particle is moving in a vertical circle with a string. Compare the lowest point B and highest point T while the string remains taut. Which statements are correct?
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Question

A particle is moving in a vertical circle with a string. Compare the lowest point B and highest point T while the string remains taut. Which statements are correct?

G1 Physics · Accepted Answer

Energy gives K_B−K_T=2mgR and v_B²−v_T²=4gR. T_B=mv_B²/R+mg, T_T=mv_T²/R−mg. Subtraction gives T_B−T_T=m(v_B²−v_T²)/R+2mg=6mg. Hence if T_T=0, T_B=6mg.