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March 27, 2017

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A crate of potatoes of mass 9.0 kg is on a ramp with angle of incline 30° to the horizontal. The coefficients of friction are μs = 0.69 and μk = 0.41. Find the frictional force (magnitude and direction) on the crate if the crate is at rest.

magnitude N
direction

  • PHYSICSSS HELP PLEASE - ,

    Wc = mg = 9kg * 9.8N/kg = 88.2 N. = Wt.
    of crate.

    Fc = 88.2 N. @ 30 Deg.=Force of crate.
    Fp = 88.2*sin30 = 44.1 N. = Force parallel to ramp.
    Fv = 88.2*cos30 = 76.4 N. = Force perpendicular to ramp.

    Fs = 0.69*76.4 = 52.7 N.,up. = Force of static friction.

    Fk = 0.41*76.4 = 31.3 N.,up. = Force of kinetic friction.

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