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ch. 5 vocal
chapter 5 vocal
Term | Definition |
---|---|
motion | an objects 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 pull exerted on an object in order to change the motion of the object;force has size and direction. |
newton | the SI unit 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 |