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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 |