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science ch. 5&6

an objects change in position relative to a reference point motion
distance traveled divided by the time interval during which the motion occured speed
the speed of an object in a particular direction velocity
the rate at which velocity changes over time;this happens if speed, direction, or both change acceleration
a push or pull exerted on an object in order to change the motion of the object; has size and direction force
the SI unit for force (symbol N) newton
the combination of all the forces acting on an abject net force
a force that opposes motion between two objects that are in contace friction
a force of attraction between objects that is due to their masses gravity
a measure of the gravitational force exerted on an object;its value can change with the location of the object weight
measure of the amount of matter in an abject mass
constant velocity of a falling object when the force of air resistance is equal or opposite in direction to the force of gravity terminal velocity
motion of an obect when only the force of gravity if action in the object free fall
the curved path that an object follows when thrown,launched,or otherwise projected near the surface of Earth projectile motion
tendency of an object to resist a change in motion unless an outside force acts on the object inertia
a quantity defined as the product of the mass and velocity of an object momentum