Forces and Motion
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23 terms
Terms | Definitions |
|---|---|
 Force | is a push or a pull |
| Newton (N) | the unit for force |
| Balanced Forces | equal but opposite; occurs when the net forces on an object equals "zero" and the objects motion does NOT change |
| Unbalanced Forces | when the net forces on an object does NOT equal "zero" and the objects motion does change |
| Gravity | force of attraction between 2 objects; determined by the mass of the objects and the distance between them |
| Weight | a measure of the force of gravity on an object's mass |
| Mass | is the amount of matter or stuff in an object |
| Friction | a force that acts in the opposite direction of motion |
| Air Resistance | a fluid frictional force on falling objects that opposes gravity |
| Speed | the rate in which an object moves: calculated by distance / time |
| Acceleration | the change in velocity over a period of time |
| Frame of Reference | used to determine if an object is in motion; the background object that you assume is stationary in order to compare it to an moving object |
| Newton's 1st Law of Motion | an object at rest will stay at rest and an object in motion will stay in motion until an outside force acts upon it |
| Newton's 2nd Law of Motion | explains the relationship between acceleration, mass and force; Force=Mass x Acceleration |
| Newton's 3rd Law of Motion | for every action there is an equal and opposite reaction |
| Motion | caused by unbalanced forces acting on an object |
| Velocity | speed in a certain direction |
| Electric | force caused by non-moving charges |
| Magnetic | force caused by moving charges |
| Centripetal | it causes objects to travel in a circular path |
| Applied | a force exerted on an object by a person or another object |
| Normal | the support force exerted upon an object that is in contact with another stable object |
| Tension | force that is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends |
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