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The coefficient of static friction between the m = 3.20 kg crate and the 35.0° incline of the figure below is 0.340. What minimum force must be applied to the crate perpendicular to the incline to prevent the crate from sliding down the incline?

  • physic -

    I assume a crate is on an incline.

    In this case, fricion + force applied has to be greater than the component of weight down the plane.

    friction: mg*mu*CosTheta
    weight down plane: mgSinTheta

    force+friction=weight down plane
    solve for force.

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