Im working on some typical "Ramp being pulled up an incline" questions and have trouble understanding something.
An example question where it stats a box is being pulled up a ramp like the image below:
Now, first: In order to find the friction force exerted on the box.
Would I simply just apply this: Δk - ΔUgravity / distance ?
AND...To find the coefficient of Kinetic friction, do I just go:
First find the normal force? which would be: n -mg cos 30 = 0, solve for n, which is 42.2N
THEN, just use this formula? ; fk = µk n ?