| Term | Definition |
|---|
| Force | A push or pull exerted on an object moves through a fluid. |
| Net force | The overall force on an object when all the individual forces acting on an object are added together. |
| Unbalanced force | A nonzero net force, which changes an object’s motion. |
| Balanced forces | Equal forces acting on an object in opposite directions. |
| Inertia | The tendency of an object to resist any change in its motion. |
| Mass | The amount of matter in an object. |
| Newton | A unit of measure that equals the force required to accelerate one kilogram of mass at 1 meter per second. |
| Friction | The force that one surface exerts on another when the two rub against each other. |
| Sliding friction | Friction that occurs when one solid surface slides over another. |
| Rolling friction | Friction that occurs when an object rolls over a surface. |
| Fluid friction | Friction that occurs as an object moves through a fluid. |
| Gravity | The force that pulls objects toward Earth. |
| Free fall | The motion of a falling object when the only force acting on it is gravity. |
| Air resistance | The fluid friction experienced by objects falling through the air. |
| Terminal velocity | The maximum velocity a falling object can achieve. |
| Weight | The force of gravity on an object at the surface of a planet. |
| momentum | The product of an object’s mass and velocity. |
| Law of conservation of momentum | The rule that the total momentum of objects in an interaction does not change. |
| Satellite | Any object that travels around another object in space. |
| Centripetal force | A force that causes an object to move in a circle. |
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