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Work and Mechanical Energy

AP Physics 1· difficulty 1/5

A 30 N30~\text{N} horizontal force pushes a box 4.0 m4.0~\text{m} across a floor in the direction of the force. How much work does the force do?

  • A

    30 J30~\text{J}

  • B

    60 J60~\text{J}

  • C

    7.5 J7.5~\text{J}

  • D

    120 J120~\text{J}

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Explanation

W=Fdcos⁡θ=(30)(4.0)(cos⁡0∘)=120 JW = F d \cos\theta = (30)(4.0)(\cos 0^\circ) = 120~\text{J}.

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