| A | B |
|---|
| force | push or pull |
| net force | overall (total) of all forces |
| weight | force of gravity |
| friction | 2 objects rubbing against each other |
| Law of Universal Gravitation | any 2 objects that have mass attract each other |
| distance between 2 objecects decreases | gravitational force decreases |
| rolling friction | one item rolls over another |
| fluid friction | friction through air or water |
| static friction | one item sitting in place on another |
| sliding friction | one item slides over another |
| when 2 forces act in same direction | add the forces together |
| inertia | tendency of object to reduce motion; based on mass |
| newton | force required to accelerate 1 kg of mass at 1 m/s2 |
| increasing friction | adding something to make more friction; sand on ice |
| reducing friction | doing something to lessen friction; waxing skiis |
| Newton's 1st Law | object in motion stay in motion; object at rest stay at rest unless acted on by outside force |
| Newton's 2nd Law | force = mass x acceleration |
| greater mass needs | greater force to accelerate the object |
| Newton's 3rd Law | for every action there is an equal and opposite reaction |
| momentum | mass x velocity |
| Law of Conservation of Momentum | momentum before collision same after collision |
| momentum takes place in direction of | velocity |
| centripetal force | any force that causes an object to move in a circle |
| satellite | an object that orbits another object in space |
