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Science Vocab 3
Physics words
Term | Definition |
---|---|
motion | when an object's distance from another set object changes |
reference point | a place or object used for comparison to determine if an object is in motion |
average speed | the overall rate at what the object moves |
instantaneous speed | the speed an object travels at a given time |
speed | the distance an object travels per unit of time |
velocity | speed in a given direction |
slope | the steepness of a line on a graph that is equal to its vertical change divided by its horizontal change |
acceleration | the rate at which velocity changes |
force | a push or pull exerted by an object |
unbalanced force | forces that change an object's motion |
balanced force | equal forces acting on an object in opposite directions |
newton | a unit of measurement that equals the force to move 1 kilogram of mass at a meter per second |
net force | the overall force on an object when all the forces on it are added |
friction | the force one object exerts on another when they rub against each other |
static friction | force that acts upon nonmoving objects |
gravity | the force that pulls objects together |
sliding friction | when an object slides on a solid and creates friction |
rolling friction | when an object rolls on a solid and creates friction |
fluid friction | friction that occurs when an object moves through a fluid |
air resistance | the fluid friction in the air |
free fall | the motion of an object where the only force acting on it is gravity |
terminal velocity | the greatest velocity falling object can achieve |
inertia | when an object resists change in its momentum |
momentum | the product of the mass and velocity |
Law of Conservation of Momentum | when all outside forces are absent, the total momentum of objects that interact does not change. |