Energy and motion
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Created by:
finndog Plus on April 24, 2012
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22 terms
Terms | Definitions |
|---|---|
 position | an objects location or place |
| speed | measure the distance an object travels in a certain amount of time |
| velocity | a measure of speed in a certain direction |
| force | a push or pull that moves an object away or towards you |
| friction | a force that slows or stops motion between two surfaces that are touching |
| gravity | a force that pulls objects toward each other |
| simple machine | a tool that helps people do work by changing a force |
| kinetic energy | energy of motion |
| potential energy | energy of place or position; energy is stored in an object; an object at rest |
| mass | the amount of matter an object has |
| inertia | an object at rest stays at rest or object in motion stays in motion |
| fulcrum | point on which a lever is supported and moves |
| motion | a change in an object's position as a compared to objects around it |
| lever | a machine that does work by turning around a fixed point called a fulcrum-helps lift or move objects |
| pulley | a small wheel with a groove in it that turns on an axle-a rope fits into the groove-helps move objects up, down, or side to side |
| wedge | two inclined planes that touch at a point, it is v-shaped, helps cut or split objects apart |
| wheel and axle | 2 cylinders that turn on the same axis-large wheel attached to a small axle-helps make things move or turn |
| screw | an inclined plane wrapped around a rod-helps hold things together |
| inclined plane | a simple machine made up of a slanted surface |
| first class lever | fulcrum is between the effort and the load |
| second class lever | load is between the fulcrum and the effort |
| third class lever | effort is between the fulcrum and the load |
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