| A | B |
|---|
| A push or pull exerted on an object | Force |
| The overall force on an object when all the individual forces acting on an object are added together | Net force |
| A nonzero net force that changes an object's motion | Unbalanced forces |
| Equal forces acting on an object in opposite directions | Balanced forces |
| The tendency of a moving object to continue in a straight line or a stationary object to remain in place | Inertia |
| A unit of measure that equals the force required to accelerate one kilogram of mass at a rate of one meter per second | Newton |
| A force that one surface exerts on another when the two rub against each other | Friction |
| Friction that occurs when one solid surface slides over another | Sliding friction |
| Friction that occurs when an object rolls over a surface | Rolling friction |
| Friction that occurs as an object moves through a fluid | Fluid friction |
| The force that pulls objects toward each other | Gravity |
| The motion of a falling object when the only force acting on it is gravity | Free fall |
| An object that is thrown | Projectile |
| The fluid friction experienced by objects falling through air | Air resistance |
| The maximum velocity a falling object achieves | Terminal velocity |
| The product of an object's mass and its velocity | Momentum |
| The rule that the total momentum of objects in an interaction does not change | Law of Conservation of Momentum |
| Any object that travels around another object in space | Satellite |
| A force that causes an object to move in a circle | Centripetal force |
