| A | B |
|---|
| force | something you can push or pull on an object |
| unit of force | newton |
| balanced force | equal forces on an object that cancel out |
| unbalanced force | unequal forces on an object |
| distance | how far you go |
| displacement | distance between the starting and end point |
| speed | how fast you go; the formula is distance divided by time |
| velocity | speed with a direction; the formula is final velocity minus original velocity speed over time |
| acceleration | the change in velocity over time |
| three things that affect acceleration | speeding up, slowing down, and changing direction |
| inertia | resistance to motion and mass affects it |
| first law of motion | an object at rest or in motion will stay that way unless an outside force acts upon it |
| second law of motion | a net force on an object causes it to accelerate in the direction of the force |
| third law of motion | for every action there is an equal and opposite reaction |
| friction | resistance force caused when two surfaces touch and it is affected by the type of surface and the mass of the object |
| three types of friction | static friction, sliding, and rolling |
| three ways to decrease friction | lubrication, wheels, sanding/polishing |
| momentum | inertia in motion, mass x velocity = P |
