| A | B |
|---|
| force measured in this unit | Newtons (N) |
| Newton | force that causes a 1-kg mass to accelerate at a rate of 1 meter per second each second |
| force | a push or pull that acts on an object |
| Net force | The overall force acting on an object after all the forces are combined |
| Friction | A force that opposes the motion of objects that touch as they move past each other |
| static friction | A friction force that acts on object that are not moving |
| Sliding Friction | A friction force that opposes the motion of an object as it slides over a surface |
| Rolling Friction | A friction force that acts on rolling objects, caused by the change in shape at the point of rolling contact |
| Fluid Fricrtion | a friction force that opposes the motion of an object through a fluid |
| Air resistance | fluid friction acting on an object moving through the air |
| Gravity | The attraction between any two objects because of their mass |
| Terminal Velocity | The constant velocity of a falling object when the force of air resistance equals the force of gravity |
| Projectile Motion | The curved path of an object in free fall after it is given an initial forward velocity |
