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# Chap. 5 Voc.

### Matter in Motion

Vocabulary WordDefinition
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 occured
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 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 tat are in contact
Gravity a force of attraction between two 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
Created by: Beth #5