| A | B |
|---|
| force | a pull or push on an object |
| net force | the overall force when all individuall forces are added together |
| unbalanced forces | a net force that changes an objects motion |
| balanced forces | equal forces on an object in opposite directions |
| inertia | the tendency of a moving object to continue in a straight line or a stationary object to remain in the same place |
| momentum | the product of an objects mass and velocity |
| law of conservation of motion | the rule that the total momentum of objects in an interaction does not change |
| newton(N) | a unit of measure that equals the force required to accelerate one kg of mass at a rate of one m/s/s |
| sliding friction | friction that occurs when one solid object slides over another |
| friction | a force that one surface exerts on another when the two rub against each other |
| rolling friction | type of friction when one objects rolls over a surface |
| fluid friction | friction that occurs when an object moves through a fluid |
| gravity | the force that pulls objects toward the earth |
| free fall | the motion of a falling object when the only force acting on it is gravity |
| projectile | an object that is thrown |
| air resistance | the fluid friction an object experiences when falling through air |
| terminal velocity | the maximum velocity a falling object achieves |
| satellite | any object that travels around another object |
| centripetal force | a force that causes an object to move in a circle |
