urgent!!!! Please help!!!!!!?

Question

a 10 kg object is being pulled to the left at a constant speed of 2.5 m/s. F norm is 80 and there is a 30 degree angle. find the applied force, F grav force, "mu" force, and the friction force.

Please help!! I know its a lot of work, but im soo stuck!!

Answer 1

since the speed is constant there is no acceleration, so the forces all balance

if f norm is 80, this is related to Fapplied as
80=10*9.8-Fapplied*sin(30)
solve for Fapplied
Fapplied = 36 N

The coefficient of friction, mu is related to the applied force and normal force as
Fapplied*cos(30)=Fnorm*mu
mu=36*cos(30)/80
mu=0.39

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