A big box having your new computer sits on the bed of the pick-up truck. You are stopped at a red light. The light turns green and you stomp on the gas and the truck accelerates. To your horror, the box begins to slide toward the back of the truck. (Suppose that the truck is accelerating to the right.)
Part A: Sketch clearly labeled free-body diagram for the box. (The bed of truck is not frictionless.)
Part B: Sketch clearly labeled free-body diagram for the truck. (The bed of the truck is not frictionless.)