Chapter 15

1. - sunlight that is converted into usable energy
5. - a source of energy that exists in limited quantities and, once used, cannot be replaced except over the course of millions of years
7. - the energy stored in atomic nuclei
11. - a rigid bar that is free to move around a fixed point
13. - the energy associated with electric
14. - thermal energy beneath Earth’s surface Biomass energy - the chemical energy stored in living things
16. - the energy stored in chemical bonds
17. - a device that changes a force & helps you do work
20. - potential energy that depends upon an object’s height above Elastic
22. - the practice of finding ways to use less energy or to use energy more efficiently
23. - a V-shaped object whose sides are two inclined planes sloped toward each other
24. - energy obtained from flowing water
26. - energy that travels in waves
27. - the potential energy of an object that is stretched or

2. - a source of energy that can be replaced in a relatively short period of time
3. - energy dealing with temperature
4. - the energy an object has due to its motion
6. - an inclined plane wrapped around a cylinder
8. - energy that is stored as a result of position or shape
9. - a simple machine that consists of a rope that fits into a groove in a wheel
10. - the rate of doing work
12. - the ability to do work
15. - a simple machine that consists of two rigidly attached disks or cylinders, each one with a different radius
18. - a slanted surface along which a force moves an object to a different elevation
19. - rich deposits of hydrocarbon mixtures that formed from the remains of organisms
21. - the process of changing energy from one form to another
23. - the product of distance and the force in the direction an object moves
25. - the energy associated with the motion and position of everyday objects