| A | B |
|---|
| atom | basic unit of all matter |
| chemical bond | strong attraction between atoms |
| chemical energy | energy stored in chemical bonds |
| chemical equation | arrangement of symbols, formulas, and numbers to describe a chemical reaction |
| chemical reaction | process that produces one or more new substances |
| conservation of mass and energy | theory which states that mass and energy can be neither created or destroyed |
| element | substance with only one kind of atom |
| energy | ability to do work or change matter |
| force | a push or a pull |
| friction | force which resists motion between surfaces |
| kinetic energy | energy of motion |
| mass | amount of material in an object |
| matter | anything that takes up space |
| molecule | any two atoms joined together |
| potential energy | stored energy an object has because of its position |
| power | the rate or speed at which work is done |
| work | when a force moves and object in the direction of the force |
| lubricate | to apply oil, grease, or other substances to reduce friction |
| joule | unit used to measure energy and work |
| horsepower | unit used to measure power (not metric) |
| watt | metric unit used to measure power |
| compound | substance made of two or more different kinds of atoms |
| mechanical energy | energy that an object has because of its moving parts |
| electrical energy | energy carried by moving charges |
| air resistance | the opposition to motion caused by air particles |
| streamlining | rounding of surfaces of objects to reduce air resistance |
| rolling friction | friction that results when a round object rolls over a substance |
| sliding friction | friction that results when two solid surfaces slide across each other |
