Choose an appropriate closed system and draw a bar diagram representing the energy conversions and transfers that occur during each process of Checkpoint 7.9:

(a) a ball launching as the compressed spring it sits on expands, 

(b) a ball released from some height and falling to the ground,

(c) a coasting bicycle slowing down, 

(d) a car accelerating on a highway.

Data from Checkpoint 7.9

For each of the following processes, determine what energy conversion takes place and classify the interaction as dissipative or nondissipative.

The launching of a ball by the expanding of a compressed spring,

The fall of a ball released a certain height above the ground,

The slowing down of a coasting bicycle,

The acceleration of a car.