Physics - Chapter 5 Study Guide

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1. Define each of the following:
        a) gravitational potential energy
        b) kinetic energy
        c) elastic potential energy
        d) power

2. What happens to the potential energy and kinetic energy of an object as it falls toward Earth?

3. How can the total energy of an object being thrown into the air be expressed at any point in its flight?

4. What happens to the kinetic energy of an object if both its mass and velocity are doubled?

5. A horizontal force of 175 N is applied to move a 32 kg object across a 8.0 m level surface.  What is the work done by the 175 N force on the object?

6. A water fountain shoots water every half minute to a height of 12.0 m. With what velocity does the water leave the fountain?

7. A ball rolls off of a 7.5 m hill with a velocity of 2.3 m/s and then rolls up a second hill that is 4.3 m high. What is the velocity of the ball at the top of the second hill?

8. What is the average power output of a child who lifts 25 kg 0.87 m in 1.3 s?

9. A man having a mass of 79.5 kg is riding in a car that has a mass of 1875 kg. If the man and the car together have a kinetic energy of 3.31 x 10⁵ J, how fast are they moving?

10. A 341 kg motorcycle accelerates from rest to 21.3 m/s in 4.2 s.
            a) How much work is done by the motorcycle?
            b) What is the average power output of the motorcycle?

11. A mover pushes a crate with a horizontal force of 29.6 N over a level distance of 6.31 m. If a frictional force of 20.8 N acts on the crate in a direction opposite to that of the worker, what net work is done on the crate?