| A | B |
|---|
| force | a push or pull on an object that can cause it to change motion |
| gravity | a force that pulls any two objects toward each other |
| 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 moving objects |
| work | the result of a force moving an object |
| simple machine | a machine made of one or two parts |
| compound machine | a machine made of two or more simple machines |
| complex machine | a machine made of many simple and compound machines |
| bonus | tell on word and definition |
| energy | the ability to do work |
| potential energy | energy that 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 |
