| A | B |
|---|
| Force | A push or pull exerted on an object |
| Newton | A unit of measure that equals the force required to accelerate 1 kilogram of mass at 1 meter per second per second |
| Net Force | The overall force of an object when all the individual forces acted on it are added together |
| Unbalanced Force | Force that produces a nonzero net force, which changes an objects motion |
| Balanced Force | Equal forces acting on an object in opposite directions |
| Friction | The force the one surface exerts on another when the two surfaces rub against each other |
| Gravity | The force that pulls objects toward each other |
| Mass | The amount of matter in an object |
| Weight | The force of gravity on an object at the surface of a planet |
| 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 greatest velocity a falling object can achieve |
| Projectile | An object that is thrown |
| Inertia | The tendency of an object to resist any change in its motion |
| Momentum | The product of an object's mass and velocity |
