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equal but opposite; occurs when the net forces on an object equals "zero" and the objects motion does NOT change
when the net forces on an object does NOT equal "zero" and the objects motion does change
force of attraction between 2 objects; determined by the mass of the objects and the distance between them
Frame of Reference
used to determine if an object is in motion; the background object that you assume is stationary in order to compare it to an moving object
Newton's 1st Law of Motion
an object at rest will stay at rest and an object in motion will stay in motion until an outside force acts upon it
Newton's 2nd Law of Motion
explains the relationship between acceleration, mass and force; Force=Mass x Acceleration
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