An 8.0 kg crate is pulled up a 30 degree incline by a person pulling on a rope that makes an 18 degree angle with the incline. The tension in the rope is 120 N and the crate's coefficient of kinetic friction on the incline is 0.25. If the crate moves 5.0 m, what is the work done by a.) friction and b.) the normal force? I calculated the work done by tension in the rope to be 571 J and the work done by gravity to be -196 J. How do I find the friction and normal force?