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Kinetic and Static Friction

AP Physics 1· difficulty 2/5

A 10 kg10~\text{kg} crate sits on a floor with coefficient of static friction μs=0.30\mu_s = 0.30. Using g≈10 m/s2g \approx 10~\text{m/s}^2, what is the minimum horizontal force needed to start it moving?

  • A

    3 N3~\text{N}

  • B

    10 N10~\text{N}

  • C

    30 N30~\text{N}

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  • D

    100 N100~\text{N}

Explanation

The applied force must exceed fs,max⁡=μsmg=(0.30)(10)(10)=30 Nf_{s,\max} = \mu_s m g = (0.30)(10)(10) = 30~\text{N}.

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