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Rotational Equilibrium and Newton's First Law in Rotational Form

AP Physics 1· difficulty 2/5

25 kg 40 kg 1.6 m d

A 25 kg25~\text{kg} child sits 1.6 m1.6~\text{m} from the pivot. To balance, a 40 kg40~\text{kg} child must sit at distance

  • A

    1.5 m1.5~\text{m}

  • B

    2.5 m2.5~\text{m}

  • C

    1.0 m1.0~\text{m}

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  • D

    0.5 m0.5~\text{m}

Explanation

25⋅1.6=40⋅d⇒d=40/40=1.0 m25 \cdot 1.6 = 40 \cdot d \Rightarrow d = 40/40 = 1.0~\text{m}.

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