- #1
Phyba
- 9
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A 20 Kg. mass slides up on an infinitely long inclined plane (that forms an angle of 30º with the horizontal) with a velocity of 12 m/s. It's known that the mass returns to the starting point with a velocity of 6 m/s. Find,μ, the coefficient of friction between the plane and the body.
This is the problem I'm struggling with. By the mechanical energy conservation principle I know that the work done by the friction force is the increment in kinetic energy. But, how can I relate that to Newton's equation to find μ.
I thought, since the frinction force is μ*mgcos30, we can say
μ*s*mgcos30 = ΔKinetic energy
where s is the distance, but we don't even know the distance!
Thanks in advance, I'm new here!
This is the problem I'm struggling with. By the mechanical energy conservation principle I know that the work done by the friction force is the increment in kinetic energy. But, how can I relate that to Newton's equation to find μ.
I thought, since the frinction force is μ*mgcos30, we can say
μ*s*mgcos30 = ΔKinetic energy
where s is the distance, but we don't even know the distance!
Thanks in advance, I'm new here!