Across
- 1. when a force moves an object
- 9. forces that are unequal
- 10. Mercury, Venus, earth, Mars,
- 12. electromagnetic waves
- 16. burning coal, oil and natural gases
- 18. stored energy
- 20. distance divided by time
- 21. stored in atoms and molecules
- 22. make work easier
- 24. combination of all forces actions upon an object or system
- 25. work
- 27. ex:bike
- 30. closest planet to sun
Down
- 1. process by which rocks are broken down into sediment over time
- 2. nature makes other energy sources, reusable
- 3. push or pull
- 4. transfer of heat when particles collide
- 5. forces that are equal
- 6. energy in motion
- 7. Jupiter, Saturn, Venus, Neptune
- 8. pulls object toward center of earth
- 11. tendancy for plants to turn towards sunlight
- 13. gasses and liquids move in particles
- 14. pressure built up inside cell walls when plant absorbs water
- 15. supply of energy resources are limited, nonreusable
- 17. distance times speed
- 19. plant turns towards or away from from pull of gravity
- 23. hottest planet in solar system
- 26. measure of force of gravity on an object
- 28. work divided by force
- 29. ex:elevator