| A | B |
|---|
| force | An action that has the ability to change motion |
| pound | The English unit of force |
| newton | The metric unit of force |
| Newton's 1st Law | Objects at rest stay rest, and objects in motion stay in motion, unless acted on by a force |
| inertia | The property of a body to resist changing its state of motion |
| mass | A measurement of the amount of matter |
| kilogram | The metric unit of mass |
| Newton's 2nd Law | Force causes an object to accelerate , while the object's mass resists acceleration |
| net force | The total forces acting on an object |
| equilibrium | When an object has a net force of zero acting on it |
| gravity | A force that pulls every mass toward every other mass |
| weight | The force that is created by gravity on objects |
| friction | The force that results from the relative motion between objects |
| wear | The grinding away of moving parts that are in contact with each other |
| Newton's 3rd Law | For every action, there is an equal and opposite reaction |
| viscous friction | Friction caused by the movement of an object through a liquid |
| sliding friction | Friction caused by the movement of surfaces against each other |
| rolling friction | Friction caused by one object rolling over another |
| air friction | Friction caused by the movement of air around moving objects |
| momentum | The mass of an object multiplied by its velocity |
