| A | B |
|---|
| Gravity | the force of attraction between 2 objects |
| Inertia | the tendency of an object to continue moving or staying at rest |
| Friction | the force of 2 surfaces rubbing together |
| Mass | the amount of molecules (matter) in an object |
| Force | a push or pull exerted on an object |
| Weight | the pull of an object due to gravity |
| Air Resistance | a force that slows down objects with large surface areas, type of friction |
| Newton's Law 1 | An object in motion stays in motion unless a force acts on it. An object at rest stays at rest unless a force acts on it. |
| Newton's Law 2 | An object's acceleration depends on it's mass and the force applied to it (F=ma). |
| Newton's Law 3 | For every action, there is an equal and opposite reaction. |
| Example of Law 1 | A sled continues to move downhill when a child stops to tie her shoe. |
| Example of Law 2 | A pitched baseball has more force than a baseball that is tossed. |
| Example of Law 3 | A swimmer pushes water back with her arms and her body moves forward. |
| 9.8 m/s/s | the rate of acceleration due to gravity on earth |
| 2 factors that increase gravitational force | more mass, closer together |
| 2 forces that are equal when falling at a constant speed | gravity and air resistance |
| Any 2 objects will land ____________ unless air resistance acts upon them. | at the same time |
