Circular Motion

AP Physics 1· difficulty 2/5

A puck of mass 0.30 kg0.30~\text{kg} on a frictionless air-hockey table is attached by a string to a peg, moving in a circle of radius 0.60 m0.60~\text{m} at 4.0 m/s4.0~\text{m/s}. The string tension is

  • A

    12 N12~\text{N}

  • B

    8 N8~\text{N}

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  • C

    2 N2~\text{N}

  • D

    4 N4~\text{N}

Explanation

T=mv2/r=(0.30)(16)/0.60=8.0 NT = m v^2/r = (0.30)(16)/0.60 = 8.0~\text{N}.

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