A 4000 kg truck is parked on a 15˚ slope. How big is the friction force on the truck? The coefficient of static friction between the tires and the road is 0.90.

Question

anonymous · Answer

The answer is 10000 N

anonymous · Answer

|dw:1441558783042:dw|First job is to determine the normal force, $F_N$. Can you do that?

anonymous · Answer

@ospreytriple yes, it is 39200 N

anonymous · Answer

Sorry, that's not it. You must resolve $F_g$ into its components perpendicular and parallel to the incline.|dw:1441559811875:dw|The normal force is equal in magnitude and opposite in direction to $F_{g,x'}$.