| Term | Definition |
|---|
| physical properties | the properties that you can observe without changing a substance into a new substance |
| physical change | a change from one state (solid or liquid or gas) to another without a change in chemical composition |
| force | a push or pull exerted on an object |
| gravity | the force that pulls objects towards earth |
| weight | A measure of the force of gravity on an object |
| magnet | an object that has the natural power to pull other objects toward it or push other objects away |
| friction | the force that opposes the motion of one surface as it moves across another surface |
| balance | an instrument used for comparing the mass or weight of two or more objects. Equal amount of visible weight. |
| unbalance | throw out of balance or equilibrium |
| motion | a natural event that involves a change in the position or location of something |
| speed | the distance an object travels per unit of time |
| acceleration | an increase in speed |
| distance | the extent or amount of space between 2 things, points, lines, etc. |
| lever | a rigid bar pivoted about a fulcrum |
| fulcrum | n. The support on or against which a lever rests, or the point about which it turns. |
| pulley | a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope |
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