Across
- 1. A force that opposes motion between two surfaces that are in contact
- 4. mechanical energy that travels as waves through the air or water and vibrates the ear drum upon contact
- 6. Energy that causes a change in temperature of materials
- 8. A force that pulls objects toward each other
- 9. material that allows heat or electrical energy to easily flow through it
Down
- 2. material through which heat or electricity does not easily flow
- 3. energy that can be sensed by the eye
- 5. of motion
- 7. to pull toward