| A | B |
|---|
| force | push or pull |
| gravity | force of attraction |
| matter | takes up space and has mass and weight |
| contact force | one object pushes against another |
| friction | force that resists motion |
| lodestones | naturally magnetized iron ore; used in compasses |
| work | force over distance (requires movement) |
| energy | the ability to do work |
| chemical energy | requires a chemical reaction |
| kinetic energy | energy of motion |
| potential energy | stored energy |
| transfer of energy | passes from one object to another |
| engine | converts energy from a natural source into useful work |
| condensation | the point when gases or vapors to a liquid |
| combustion | burning |
| fluid or liquid | a substance that flows; no definite shape |
| cylinder | a hollow space in which a piston moves back and forth |
| piston | a disk that moves within the cylinder |
| octane number | indicates the anti-knock quality of gasoline |
| turbine | a wheel of curved blades that spins a drive shaft |
| turbofan | a jet engine with a fan in front |
| turboprop | a jet engine with a propeller |
| ramjet | a jet engine with no turbine |
| missile | a guided military rocket |
| payload | the cargo in the nose of a rocket |
| solid | has a definite shape |
| gas | floats and has no permanent shape |
| melting point | point at which a solid changes into a liquid |
| 32 degrees F | freezing/melting temp of water |
| freezing point | point at which a liquid changes to a solid |
| 212 degrees F | boiling/condensation temp of water |
| boiling point | point at which a liquid changes to a gas |
| condensation point | point at which a gas changes to a liquid |
| internal-combustion engine | fuel is burned inside the engine |
| external-combustion engine | fuel is burned outside the engine |
