1. The brakes do a certain amount of work to stop a car that is moving at a particular speed. How much work must the brakes do to stop a car that is moving four times as fast? 2. Cite the law of...

1. The brakes do a certain amount of work to stop a car that is moving at a particular speed. How much work must the brakes do to stop a car that is moving four times as fast?

2. Cite the law of energy conservation.

3. What is the source of energy that powers a hydroelectric power plant?

101:

1. Can a machine multiply input force? Input distance? Input energy? (If your three answers are the same, seek help. The last question is especially important.)

2. A force of 50 N applied to the end of a lever moves that end a certain distance. If the other end of the lever is moved half as far, how much force does it exert?

3. Is it possible to design a machine that has an efficiency greater than 100%? Discuss.