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2. energy- the chemical energy stored in living things
4. energy- sunlight that is converted into usable energy
5. plane- a slanted surface along which a force moves an object to a different elevation
6. 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
7. energy- the energy an object has due to its motion
8. fuels- rich deposits of hydrocarbon mixtures that formed from the remains of organisms
9. a simple machine that consists of a rope that fits into a groove in a wheel
10. a V-shaped object whose sides are two inclined planes sloped toward each other
12. a rigid bar that is free to move around a fixed point
14. energy- thermal energy beneath Earth’s surface
17. energy- the energy stored in chemical bonds
19. a device that changes a force & helps you do work
20. and axe- a simple machine that consists of two rigidly attached disks or cylinders, each one with a different radius
22. the product of distance and the force in the direction an object moves
23. conversation- the practice of finding ways to use less energy or to use energy more efficiently
25. an inclined plane wrapped around a cylinder
26. energy- energy dealing with temperature
27. energy- the energy associated with the motion and position of everyday objects

1. potential energy - potential energy that depends upon an object’s height above a reference point
3. energy- energy that is stored as a result of position or shape
9. the rate of doing work
11. energy- the energy associated with electric charges
13. the ability to do work
15. energy- the energy stored in atomic nuclei
16. potential energy- the potential energy of an object that is stretched or compressed
18. energy- energy that travels in waves
21. energy- energy obtained from flowing water
24. energy- a source of energy that can be replaced in a relatively short period of time