I can get answer B if I only calculate the y component of the Weight force. But that leaves the x component of the Weight force unaccounted for.
Can the x component just not contribute to keeping the mass on the incline?
(I drew a FBD as I understand you are saying)
OK if there is no friction, I don't know if there is or not since the problem did not say there is or not.
The portion of the Weight force directed down the incline would be sin 15* W.
Since the skater isn't moving, then the force that must be overcome to get this mass rolling should be equal...
Homework Statement
A skateboarder + skateboard has a combined mass of 70 kg.
How much force is required to prevent them from rolling down a 15 degree incline?
Homework Equations
Weight = 70kg * 9.81m/s^2
Normal = cos 15 * W
Friction = sin 15 * W
The Attempt at a Solution
I...