1. The problem statement, all variables and given/known data A car is going down an incline with a constant acceleration. How much work was done on the car by the force of the road going down the hill? (neglect energy losses due to air resistance, rolling friction, etc.) 3. The attempt at a solution There are 2 forces acting on the car from the road, the normal force and static friction. But the displacement of both the normal force and static friction are both 0, so how is static friction doing work?