| A | B |
|---|
| force | a push or pull |
| gravity | the force that attracts objects to each other |
| weight | the measure of the pull of gravity on an object |
| buoyant force | the upward push of a liquid or a gas on an object |
| magnetism | the attraction between a magnet and a magnetic object |
| attract | or pull together (unlike poles do this) |
| repel | push away from each other (like poles do this) |
| motion | a change in position |
| distance | can be measured with a meter stick |
| direction | measured wit a compass |
| speed | the distance an object travels in a certain amount of time |
| velocity | an object's speed in a particular direction |
| acceleration | a change in velocity --occurs when an object speeds up, slows down, or changes direction |
| inertia | the tendency of an object to resist a change in motion |
| balanced forces | forces that are equal and opposite cancel each other out -- object does not move |
| unbalanced forces | forces are NOT equal and opposite -- they cause a change in motion |
| work | what happens when a force moves an object a certain distance |
| simple machines | make work easier |
| inclined plane | can reduce the amount of force needed to move a heavy object uphillu |
| lever | can reduce the amount of force needed to raise heavy objects off the ground |
| wedge | can reduce the amount of force needed to split apart objects |
| wheel and axle | can reduce the amount of force or the distance you apply the force |
| pulley | can be used to change the direction of a force or reduce the amount of force needed to lift a heavy object |
| screw | can reduce the amount of force needed to fasten two objects together |
| wedge | can reduce the amount of force needed to split apart objects |
