| A | B |
|---|
| Force | Any push or pull that makes an object start moving, stop, speed up, slow down, or change direction |
| Energy | the ability to do work either to make an object move or change matter |
| work | the use of a force to make an object move a certain distance |
| Friction | a force between surfaces that slows objects down or stops them from moving |
| inertia | the tendancy of an object to remain in motion or to stay at rest unless acted upon by an outside force |
| speed | the distance traveled in a certain amount of time |
| effort force | the amount of force needed to move something |
| simple machine | a machine with a few moving parts making it easier to do work |
| load | object being lifted or moved by a machine |
| efficiency | the measure of how much use for work a machine puts out compared to the amount of work put into it |
| acceleration | any change in the speed or direction of a moving object |
| frame of reference | a description of the position of an object in terms of other objects that surround it |
| weight | the measure of the pull of gravity between an object and earth |
| two factors used to calculate speed | time and distance |
| the unit that force is measured in | Newtons |
| two parts of a lever | fulcrum and plank of wood |
| six simple machines | wedge, screw, inclined plane, pulley, wheel and axle, and lever |
| compound machine | two or more simple machines put together |
| three forms of energy | thermal, light and nuclear |
