Across
- 4. a device that converts energy from a natural source into useful work
- 6. a special form of potential energy stored in the bonds that hold chemical compounds together
- 7. a number that indicates the antiknock quality of gasoline
- 12. anything that takes up space and has mass and weight
- 13. the force that occurs when one object pushes against another object
- 15. a piece of naturally magnetized ore
- 17. a hollow, cylinder shaped compartment in which a piston moves back and forth
- 18. the cargo that is carried in the nose of a rocket
- 21. burning
- 22. a disk that moves back and forth inside a hollow cylinder
- 23. the ability to do work
- 24. a device that converts gases or vapors into a liquid state
- 25. the force of attraction that exists between any pair of objects
Down
- 1. a guided military rocket
- 2. a wheel of curved blades that spins a drive shaft
- 3. the force that resists motion
- 5. a jet engine with a large fan at the very front
- 8. a jet engine that can function only at high speeds because it has no turbine
- 9. the result of a force moving an object
- 10. occurs when one object gives some or all of its energy to another object
- 11. stored energy
- 14. a substance that can flow from one place to another such as a liquid or gas
- 16. energy of motion
- 19. a jet engine used to power a propeller
- 20. a push or pull; necessary for motion