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Glossary of Motion, Force, Friction, and Gavity

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Motion
an object’s change in position over time when compared with a reference point
Speed
the rate at which an object moves; speed depends on the distance traveled and the time taken to travel that distance
Velocity
the speed of an object in a particular direction
Acceleration
the rate at which velocity changes; an abject accelerates if its speed changes, or its direction changes, or if both its speed and its direction changes
Force
a push or a pull; all forces have both size and direction
Newton (N)
the SI unit of force
Net Force
the force that results from combining all the forces exerted on an object
Friction
a force that opposes motion between two surfaces that are touching
Gravity
a force of attraction between objects that is due to their masses
Weight
a measure of the gravitational force exerted on an object, usually by the Earth
Mass
the amount of matter that something is made of; its value does not change with the objects location in the universe

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