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    dimplegal's Avatar
    dimplegal Posts: 1, Reputation: 1
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    #1

    Nov 9, 2009, 06:17 PM
    Determining frictional force
    A box with the weight 50 N is lying on the plank. The length is 1.50 m. Determine the frictional force between the box and the plank?
    The height is 0.75 m.
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #2

    Nov 9, 2009, 09:18 PM

    The frictional force is the coefficient of friction (that you didn't give) times the normal force.
    jwtear's Avatar
    jwtear Posts: 6, Reputation: 1
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    #3

    Nov 14, 2009, 11:18 AM

    frictional force = v^2 / g
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