Newton's Second Law (Translational Dynamics)

AP Physics 1· difficulty 3/5

A 1.0 kg1.0~\text{kg} pendulum bob hangs at rest in an elevator that accelerates downward at 4.0 m/s24.0~\text{m/s}^2. Using g10 m/s2g \approx 10~\text{m/s}^2, the string tension is

  • A

    6 N6~\text{N}

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  • B

    4 N4~\text{N}

  • C

    10 N10~\text{N}

  • D

    14 N14~\text{N}

Explanation

T=m(ga)=1.0(104)=6 NT = m(g - a) = 1.0(10 - 4) = 6~\text{N}.

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