Energy and Electricity Reading Questions 10.1 Energy and Work 1. . is the product of the force exerted on an object and the distance the object moves in the direction of the force. 2. What unit is work measured in? 3. A satellite orbits around Earth. Does Earth's gravity do any work on the satellite? Why or why not? 2. You lift a box of books that weighs 185 N. The box is lifted .8 m off the ground. How much work did you do on the box? 3. Two students together exert a force of 825 N while pushing a car 35 m. How much work do they do on the car? b. If the force were doubled, how much work would they do pushing the car the same distance. 4. A .18 kg ball falls 2.5 m. How much work does the force of gravity do on the ball? 5. You and your friend each carry identical boxes to a room one floor above you and down the hall. You choose to carry it first up the stairs, then down the hall. Your friend carries it down the hall, then up another stairwell. Who does more work? Explain your answer. 20.2 Electrical Forces 6. There are two kinds of electrical charge, . b. Electrical charge cannot be created or c. Objects can be charged by the transfer of and _ ; it is conserved. 7. If you comb your hair on a dry day, the comb can become positively charged. Can your hair remain neutral? Explain. 8. Explain what property makes metal a good conductor and rubber a good insulator? 21.1 Creating and Measuring Electric Fields 9. Electric field lines provide a picure of the electic field. They are directed away from _charges and toward charges. 10. Sketch some electric field lines between: a) two like charges b) two unlike charges c) two parallel plates of opposite charges 11. What are the two properties that a test charge must have? 12. What are electric field lines? Dashboard Calendar To