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March 29, 2017

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A 4.0 kg object is lifted 1.5 m. (a) how much work is done against the earth's gravity ? (b) repeat if the object is lowered insteadof lifted

  • physics - ,

    The definition of work is (force) x (distance moved in the direction of the force)

    (a) In this case, the force is M*g.
    I assume that you know the value of g.
    M is the mass. Complete the calculation.

    (b) Change the sign of the previous answer. Negative work is done by whatever is lowering the weight.

  • physics - ,

    Answer

  • physics - ,

    Force X Displacement
    Force=mass X gravity
    => m g s
    = 4 x 10 x -1.5
    = -60 J

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