| A | B |
|---|
| equlibrium | a state of balance |
| force | any influence that tends to accelerate an object; push or pull |
| friction | The force that acts to resist the relative motion of objects or materials that are in contact |
| inertia | reluctance of any body to change its state of motion. |
| kilogram | a fundamental S.I unit of mass |
| law of inertia | an object that is in motion, an object that is at rest stays at rest, unless acted upon by an external force |
| mass | the amount of matter in an object |
| net force | the combination of all the forces that act on an object |
| newton's first law | law of inertia |
| normal force | an object resting on a horizontal surface, the upward force that balances the weight of the object; also called the support force |
| weight | the force on a body due to gravitational attration of another body |
| air resistance | friction, or drag, that acts on something moving through the air |
| fluid | anything that flows |
| inversely | when two values change into two opposite directions, so that if one is doubled the other is reduced in half |
| Newton's second law | F=ma |
| Pascal | the S.I unit of pressure |
| Pressure | force per surface area where the force is normal to the surface |
| terminal speed | the fastest you can go |
| terminal velocity | terminal speed + direction |
| Action force | one pair of forces described in newton's third law |
| Interaction | a mutual between objects where each object exerts an equal and opposite force on the other |
| Newton's third law | whenever one body exerts a force on a second body, the second body exerts an equal and opposite force on the first |
| Reaction force | the force that is equal in strength and in direction to the action force, and one that acts simultaneously on whatever is exerting the action force |
