OK here's the problem: An extremely light drivable car with a mass of only 9.50 kg was built. Suppose that the wheels of the car are locked, so that the car no longer rolls. If the car is pushed up a 30° slope by an applied for of 80.0 N, the net accel. of the car is 1.64 m/s2. What is the coefficient of kinetic friction between the car and the incline?(adsbygoogle = window.adsbygoogle || []).push({});

And where's what I've done:

m = 9.5

W = 93.195

a = 1.64

Fnet = ma = 15.58

Fapplied = 80

Ffriction = Fapplied - Fnet = 64.46

Fperendicular = CosTheta(W) = 80.709 (also Fnormal)

Fparallel = SinTheta(W) = 46.5975

Then I have:

Coeff of friction = Ffriction/Fnormal = 64.46/46.5975 = 1.3833

But according to the answers my teacher gave me, and logic (that seems a little bit high for the situation), that isn't right. Please show me where I'm going wrong. Thanks.

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# Homework Help: Objects in Incline problem

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