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science ch.5 vocab
Term | Definition |
---|---|
motion | an objects change in position relative to reference point |
speed | the distance traveled divided 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 pull exerted on an object in order to change the motion of the object; force has size and direction |
newton | the SI unit of force |
net force | the combination of all of the forces acting as an object |
friction | a force that opposes motion between two surfaces that are in contact |
gravity | a force of attraction between objects |
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 |