1st problem: If and object has a weight of 100 N and a frictional force of 50 N exerted on it, what is the coefficient of friction?
2nd problem: A Block with a mass of 50 kg, is pulled with a force of 10 N at an angle of 10 degrees to the horizon, if the coefficient of friction is 0.1, what is the frictional force?
F = uN
with F = Frictional force
u = mew, coefficient of friction
N = normal force
Sin and Cos functions
The Attempt at a Solution
1) 50N = u*100N
50N/100N = u = 0.5
The solutions i found for this online says the answer is 0.2, which seems incorrect to me. Is my answer of 0.5 true?
2) F = (0.1) * [(50kg*9.8)-10sin(10)]
F = 48.8
the solution i found online to problem two uses the cos instead of sin function. This does not make any sense to me as the sin is what will give you the upwards force of the rope pulling the block right? Cos would give you the horizontal force which does not affect the normal, is my approach correct?