Homework Help: phy

Posted by poul 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 - bobpursley, 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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