1. A 1500kg car is traveling along a straight road at 20m/s. Two seconds later, it's speed is 21m/s. What is the magnitude of the net force acting on the car during this time?
2. What are the forces acting on a ascending elevator hanging from a cable, that is coming to a stop?
3. A bale of hay sits on the bed of a trailer. The trailer is starting to accelerate forward, and the bale is slipping toward the back of the trailer. What will a force diagram and a free-body diagram look like for the above situation?