1. You exert a force of 4.5 newtons to slide a book across a table. If you do 2.5 J of work, how far did the book move? 2. A car reaches a top speed in 7.5 seconds. How much power did the car need if the work done was 2.5 X 105 J?

3. A 600 Newton person enters an elevator. The elevator lifts the person 6 m in 10 seconds. How much power was needed to lift the person?

4. What is the force exerted on a 15 Kg object if the object accelerates at 6 m/s2 ?

5. What is the acceleration of a 45 Kg object that is pushed with a force of 350N ?

6. What is the ideal mechanical advantage of an inline plan that has a length of 20m and a height of 5 meters?

7. A pulley is used to lift a heavy box. If an input force of 123 Newtons generates an output force of 1545 Newtons what is the mechanical advantage of the pulley.

8. A box weighs 750 Newtons. The box is being pushed up an incline plane with a mechanical advantage of 4. How much effort force is needed to push the box up the incline plane?

9. What is the efficiency of a machine that requires 120 J of input work to get 35 J of useful work out?

10. What is the efficiency of a machine that requires 90 J of input work to get 40 J of useful work out?