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mechanics
16
A packing case is held on the side of a hill and given a kick down the hill. The hill makes an angle of θ to the horizontal, and the coefficient of friction between the packing case and the ground is µ. What relationship between µ and θ guarantees that the packing case eventually comes to rest?
im getting µ > tanθ
but im not sure about it.
im getting µ > tanθ
but im not sure about it.
Reply 1
I get µcosθ>tanθ, but I did it very quickly.
EDIT: µcosθ>sinθ is what I meant, so yes I agree.
EDIT: µcosθ>sinθ is what I meant, so yes I agree.
Reply 2
That answer is what I got too...means that the angle can not exceed 45 degrees, which makes sense
edit: µR > mgsinθ
=> µ > mgsinθ / mgcosθ
edit: µR > mgsinθ
=> µ > mgsinθ / mgcosθ
Reply 3
yusufu
OP
16
excellent
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