Energy

5. Ability to do work. It makes things move and change.
9. A material used to reduce or prevent the transfer of electricity, heat, or sound.
10. Energy that keeps us warm.
13. A dark area where light from its source is blocked.
15. Light travels in a _________ line.
17. Energy that an object has due to its motion or its position.
19. Materials that heat and/or electricity flow through easily.

1. Energy that comes from the movement of charged particles. Can be converted into heat, light, sound, or mechanical energy.
2. Similar charges will do this (positive & positive, negative & negative)
3. When light slows down as it passes from one substance into another (changes direction).
4. A result of the build-up of electrical charge that occurs from rubbing two objects together.
6. The movement of sound vibrations through the air. Lower pitch are spread out and move with less speed. Higher pitch are closer together and move with more speed.
7. The relative frequency (high or low) of a sound as perceived by a listener.
8. To bounce light, sound, or heat off of a surface.
11. Energy that allows us to see.
12. Quickly moving back and forth. The movement that creates sound energy.
14. Opposite charges will do this (positive & negative, positive & uncharged, negative & uncharged)
15. Energy from the Sun. Light and heat energy comes from the sun.
16. To take in without reflecting or transmitting that energy.
18. Energy we hear that is produced by the vibration of matter.