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Posted by on Monday, July 18, 2011 at 7:33pm.

A 45 kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 22 deg , the crate begins to slide downward.
1-What is the coefficient of static friction between the crate and the ramp?
2-At what angle does the crate begin to slide if its mass is doubled?

  • phy - , Monday, July 18, 2011 at 7:58pm

    before sliding...
    frictionforce=gravitydownramp
    mg*mu*cosTheta=mg*sinTheta
    mu=tanTheta at the point of sliding.

    notice mass has nothing to do with the angle.

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