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    Ball slided down incline and encounters rough surface

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    1.) A 1-kg ball starting at h = 7.2 meters slides down a smooth surface where it encounters a rough surface and is brought to rest at B, a distance 26.6 meters away. To the nearest joule what is the work done by friction?

    2.) To two decimal places, what is the coefficient of friction?

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    (1)
    By the law of conservation of energy, all the potential energy the ball had at the start is converted into kinetic energy at point A, and then, between the points A and B this kinetic energy is taken away from the ball by the friction.
    Therefore the work done by friction is
    W = - mgh

    where m = 1 kg is the ...

    Solution Summary

    The ball sliding down an incline and encounters rough surfaces are determined.

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