| A | B |
|---|
| wheel and axel | a simple machine made of a round object that turns around a rod |
| screw | a simple machine made of a flat, sloping surface wrapped around a rod |
| incline plane | a simple machine made of a flat, sloping surface |
| pulley | a simple machine made of a grooved wheel with a rope wrapped around it |
| lever | a simple machine made of a long bar or board that turns around a support |
| first class lever | a lever with the fulcrum between the load and the force |
| second class lever | a lever with the load between the fulcrum and the force |
| third class lever | a lever with the force between the fulcrum and the force |
| gear | a toothed wheel |
| Simple machine | a tool that makes work easier |
| work | happens when a force moves an object through a distance |
| compound machine | two or more simple machines working togather |
| gravity | a force that attracts objects to each other |
| force | a push or pull |
| motion | a change in position |
| speed | change in position over time (Speed =distance divided by time) |
| inertia | the tendency of an object to resist a change in motion |
| acceleration | a change in an objects sppeed or direction |
| rate | a comparison of two different values, miles per hour |
| friction | a force between two surfaces, rubbing against each other |
| mass | the amount of matter in an object |
| weight | a measure of the pull of gravity |
| Kinetic energy | the energy of motion |
| Potential energy | energy that is stored in an object |
| law | a scientific fact that has been proven |
| Newton's first law | An object continues at rest or moving at a constant speed in a straight line unless acted on by an outside force |
| Newton's second law | A force will cause a change in an objects speed |
| Newton's third law | For every action there is an equal and opposite reaction |
| wedge | a simple machine made of flat, sloping surface that moves |
| fulcrum | the pivot point of a lever |
