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12 Cards in this Set

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Background or point that is assumed to be statinary and is used for comparison when motion is described
frame of reference
Change in position in a certain amount of time
motion
Rate at which an object moves
speed
Description of speed in a given direction
velocity
Rate of change in velocity
acceleration
Mass of an object times its velocity; determines how difficult it is to stop the object's motion
momentum
push or pull that gives energy to an object,sometimes causing a change in the motion of the object
force
force that acts in the opposite direction of motion; will cause an object to slow down and finally stop
friction
property of matter that tends to resist any change in motion
inertia
unit of force; 1 kg x 1 m/sec/sec
newton
force of attraction that depends on the mass of two objects and the distance between them; responsible for accelerating an object toward the Earth
gravity
law that states that all objects in the universe attract each other by the force of gravity
Law of Universal Gravitation