| A | B |
|---|
| force | a push or a pull that gives energy to an object, causing it to start moving,stop moving, or change its motion |
| net force | the overall force on an object when all the individual forces acting on an object are accounted for. |
| unbalanced force | forces that are opposite in direction and not equal in size |
| balanced force | forces that are opposite in direction and equal in size |
| inertia | the tendency of objects to remain in motion or stay at rest unless acted upon by an outside force |
| Newton's 1st Law of Motion | states that an object at rest will remain at rest and an object in motion will remain in motion at a constant velocity unless acted upon by an outside force. |
| Newton's 2nd Law of Motion | states that the net force of an object is equal to the product of its acceleration and its mass |
| friction | a force that opposes the motion of an object |
| sliding friction | friction that occurs when one solid surface slides over another |
| rolling friction | friction that occurs when an object rolls over another surface. |
| fluid friction | friction that occurs as an object moves through a fluid |
| gravity | the force of attraction between all objects in the universe |
| 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 experienced by objects moving through the air |
| terminal velocity | the maximum velocity a falling object achieves |
| Law of Universal Gravity | states the force of gravity acts between all objects in the universe. Mass and distance are factors in this law |
| Newton's 3rd Law of Motion | states that if one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first. |
| momentum | the product of an object's mass and velocity |
| Law of Conservation of Momentum | states that the total momentum of objects in interaction does not change |
