Physics
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Created by:
langleyclass on April 25, 2011
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30 terms
Terms | Definitions |
|---|---|
 force | a push or pull on an object |
| gravity | force of attraction between all masses |
| friction | force that opposes motion |
| inertia | an object at rest tends to stay at rest, an object in motion tends to stay in motion |
| unbalanced forces | when opposite forces on an object are not equal, resulting in motion |
| balanced forces | when opposite forces on an object are equal, resulting in no motion |
| acceleration | change in speed |
| speed | the rate of motion, calculated by distance over time |
| momentum | it is harder to stop a train than a car because the greater the mass, the more the _______________ |
| velocity | speed in a given direction |
| reaction | for every action there is an opposite and equal ______________ |
| weight | a measure of the force of gravity on an object |
| mass | the amount of matter in an object |
| Newton | scientist who created three laws of motion |
| Physics | the study of the interactionof matter and energy |
| motion | process of changing position or place |
| kinetic | energy of motion |
| potential | energy that is stored/no motion |
| simple machine | a tool that makes work easier |
| wheel and axle | machine made up of a wheel and rod that goes through the wheel |
| lever | a board or bar that rests on a turning point |
| pulley | machine made up of a wheel and rope |
| fulcrum | the turning point of a lever, place that pivots |
| wedge | machine used to push two objects apart, made up of two inclined planes |
| screw | a special inclined plane that winds around |
| inclined plane | a flat surface that is higher on one end |
| distance-speed | _________ divided by time |
| centripetal force | force that causes an object to move in a circular motion |
| load | an object that a lever moves |
| matter | anything that has mass and takes up space |
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