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# matter and motion

### definitions

TermDefinition
motion an object s change in position relative to a reference point
speed the distance traveled divided by the time interval during which the motion occurred
velocity the speed of an object in a particular direction
acceleration the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change
force a push or a pull exerted on an object in order to change the motion of the object; force has size and direction
newton the SI unit for force (symbol, N)
net force the combination of all of the forces acting on an object
friction a force that opposes motion between two surfaces that are in contact
gravity a force of attraction between objects that is due to their masses
weight a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe
mass a measure of the amount of matter in an object
inertia the resistance of any physical object to any change in its state of motion (this includes changes to its speed, direction or state of rest). It is the tendency of objects to keep moving in a straight line at constant velocity.
Created by: 20mbailey