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1. the product of distance and the force in the direction an object moves
4. a V-shaped object whose sides are two inclined planes sloped toward each other
7. energy- the energy stored in chemical bonds
8. energy- energy dealing with temperature
11. a device that changes a force & helps you do work
13. energy- energy that is stored as a result of position or shape
18. potential energy- the potential energy of an object that is stretched or compressed
19. energy- the energy an object has due to its motion
21. the ability to do work
22. fuels- rich deposits of hydrocarbon mixtures that formed from the remains of organisms
23. a simple machine that consists of a rope that fits into a groove in a wheel
24. energy- the energy associated with electric charges
25. energy- the energy associated with the motion and position of everyday objects
27. the rate of doing work
28. and axe- a simple machine that consists of two rigidly attached disks or cylinders, each one with a different radius

2. energy- a source of energy that can be replaced in a relatively short period of time
3. energy- the energy stored in atomic nuclei
5. energy- thermal energy beneath Earth’s surface
6. potential energy - potential energy that depends upon an object’s height above a reference point
9. an inclined plane wrapped around a cylinder
10. energy- the chemical energy stored in living things
12. renewable energy resources-a source of energy that exists in limited quantities and, once used, cannot be replaced except over the course of millions of years
14. plane- a slanted surface along which a force moves an object to a different elevation
15. energy- energy that travels in waves
16. conversation- the practice of finding ways to use less energy or to use energy more efficiently
17. a rigid bar that is free to move around a fixed point
20. energy- sunlight that is converted into usable energy
26. energy- energy obtained from flowing water