| A | B |
|---|
| turbojet | the simplest gas turbine engine |
| ramjet | jet engine without a turbine |
| turbofan | jet engine with a large fan added at the front |
| turboprop | jet engine used to power a propeller |
| energy | the ability to do work |
| potential energy | stored energy |
| engine | a device that converts a natural form of energy into useful work |
| work | the result of a force moving an object |
| transfer of energy | when one object gives some or all of its energy to another object |
| kinetic energy | energy of motion |
| force | a push or a pull |
| gravity | the force of attraction that exsists between any pair of objects |
| friction | the force that resists motion |
| contact force | the force that occurs when one object pushes against another |
