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Gullett-Phys-Unit2
Physics-Unit2-Motion
| Term | Definition |
|---|---|
| inertia | The property of things to resist changes in motion. |
| Law of Inertia | Every object continues in a state of rest or of uniform speed in a straight line unless acted on by a non zero net force. |
| Force | a push or pull |
| Net force | the vector sum of forces that act on an object |
| mechanical equilibrium | the state of a object or system of objects for which there are not changes in motion |
| equilibrium rule | for any object or system of objects in equilibrium, the sum of the forces acting equals zero. |
| vector quantity | a quantity of force with direction and magnitude |
| tension | the pulling force exerted by a cable, chain or other continous object. |
| weight | the force due to gravity |
| support force | the upward force that equals the downward force of gravity on a stationary object. Also called normal force. |
| speed | how fast something moves; the distance traveled per unit of time |
| instantaneous speed | the speed at any instant |
| average speed | the total distance traveled divided by the time of travel |
| velocity | the speed of an object and a specification of its direction of travel |
| scalar quantity | quantity that can be described by magnitude without direction |
| acceleration | the rate at which velocity changes with time ; the change in velocity may be in magnitude or direction or both. |
| free fall | motion under the influence of gravity only |
| resultant | the sum of two or more vectors |
| parallelogram rule | the diagonal of a parallelogram shows the resultant |