1. Define energy 2. What is the equation for mechanical work? Why does a frictional force always do negative work? Is work a vector or a scaler? 3. Define power and give its units. 4. What is the Law Conservation of energy? 5. Define kinetic energy and give its equation and units. Can an object have kinetic energy if it is not in motion? 6. A lab technician carries a piece of equipment horizontally across a room from one desk to another. How much work is done on the equip ment? 7. An attendant lifts a 4 kg package from the floor to a counter, 1.6 m high. How much work was done on the package by the Attendant? 8. A cylinder rolls down a plane with a 30-degree slope. What kind of energy conversion occurs from the top to the bottom of this inclined plane? 9. Any form of stored energy may be referred to as .....................................energy. 10. The gravitational f orce F acts on two different masses, m1 and m2, when they are separated by a distance R. What will happen to the gravitational f o rce if we: (a) double the distance between them between the masses? (b) halve the distance between them between them? 11. Why can't an object that is not moving have kinetic energy and momentum? What kind of energy can it have? 12. List Kepler's 3 laws of planetary motion. 13. A planet in a faraway solar system has an elliptical orbit. The speed of the planet is 64 km/s when it is at its average distance from its sun. Which of the following is most likely to be the planet's speed when it is nearest to the sun and why? (a) 55 km/s (b) 60 km/s (c) 65 km/s (d) 70 km/s. 14. An unscrupulous gold trader learned that objects weigh different amounts at different distances from Earth's center. He planned to start buying gold by the weight at one altitude and then selling it at another altitude at the same price per weight. Should he buy at a high altitude and sell at a low altitude or vice versa? Why