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physics

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A 5-kg crate is resting on a horizontal plank. The coeffi-
cient of static friction is 0.5 and the coefficient of kinetic
friction is 0.4. After one end of the plank is raised so
the plank makes an angle of 25
with the horizontal, the
force of friction is?

  • physics - ,

    Wc = m*g = 5kg * 9.8N/kg = 49 N, = Wt.
    of crate.

    Fp = 49*sin25 = 20.3 = Force parallel to
    ramp.
    Fv = 49*cos25 = 44.4 N. = Force perpendicular to ramp.

    Fs = u*Fv = 0.5*44.4 = 22,2 N. = Force
    of static friction.

  • physics - ,

    BOOOTY HOLE

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