| A | B |
|---|
| friction | the force that opposes the motion of an object |
| mass | the amount of matter in an object |
| inertia | measured by the amount of mass in an object |
| Aristotle | defined motion as either natural or violent |
| Copernicus | originally came up with the idea of the earth revolves around the sun |
| Galileo | showed that because of friction, objects need a constant force to keep a constant motion |
| Newton | the amount of force needed to accelerate a 1kg mass 1meter/s/s |
| Force | what causes acceleration on objects |
| net force | the result of all forces acting on an object |
| normal force | the force of support from objects such as the floor or tables |
| pressure | the amount of force per unit area |
| weight | the amount of gravity on a mass |
