Coefficient of kinetic friction problem
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Coefficient of kinetic friction problem

[From: ] [author: ] [Date: 11-12-30] [Hit: ]
It turns out you dont even need to know the velocity, as long as it is constant.......
A wooden block slides directly down an inclined plane, at a constant velocity of 6.0 m/s. What is the coefficient of kinetic friction, if the plane makes an angle of 25 degrees with the horizontal?

I understand that µ= F/FN which then simplifies to ma/mg, and then a/g, but how do i get the acceleration..?

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If the velocity is constant, then Newtons first law applies. The acceleration is zero, hence the force is zero.

Fnet = 0
Fg - Ff = 0
Fg = Ff
mgsin25 = ukmgcos25
uk = sin25 / cos25
uk = tan25<-----------Answer (I don't have a calc to finalize)

It turns out you don't even need to know the velocity, as long as it is constant.
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