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    jmartinez11's Avatar
    jmartinez11 Posts: 1, Reputation: 1
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    #1

    Mar 4, 2009, 09:26 AM
    Momentum- Gravitation
    A block of wood with a mass M=4.65 kg is resting on a horizontal surface when a bullet with a mass m=18g and moving with a speed v= 725m/sec. strikes it. The cofficient of friction between the block and the surface is =0.35. The distance the blokc moves across the surface is?
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #2

    Mar 4, 2009, 05:19 PM

    The bullet has kinetic energy . The coefficient of friction between the block and the surface consumes all of that kinetic energy. ( where μ is the coefficient of friction and N is the "normal" (downward) force). You simply have to figure out the distance to consume that much energy.

    Friction - Wikipedia, the free encyclopedia
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