| Term | Definition |
|---|
| force | a push or a pull on an object that can cause it to change direction |
| gravity | a force that pulls any two objects toward one another, such as you toward the center of the earth |
| inertia | the tendency of a moving object to stay in motion or a resting object to stay at rest |
| friction | a force that slows the motion of a moving object |
| energy | the ability to do work |
| potential energy | energy than an object has because of position |
| kinetic energy | energy of motion |
| mechanical energy | the kind of energy an object has because it can move or because it is moving |
| chemical energy | energy that comes from chemical changes |
| electrical energy | energy that comes from the flow of electricity |
| work | the result of a force moving an object |
| simple machine | a machine made of one or two parts |
| inclined plane | a simple machine with a flat surface and one end higher than the other |
| wheel and axle | a simple machine made of a wheel attached to a rod |
| wedge | a simple machine that has slanted sides |
| lever | a simple machine with a fulcrum that changes the direction of the force |
| pulley | a simple machine that uses a rope and a wheel |
| screw | a simple machine that has an inclined plane wrapped around a rod |
| compound machine | a machine made of two or more simple machines |
| complex machine | a machine made of many simple and compound machines |
Combine with other sets
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