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frame of reference
the things around you that you can sense and use to describe motion
position
a certain place
speed
a measure of an object's change in position during a unit of time: for example, "10" meters per
second
motion
a change in position
relative motion
a motion that is described based on a frame of reference
force
a push or pull
acceleration
a change in the speed or direction in an object's motion
newton
the metric or systeme international (sf), unit of force
weight
a measurement of the force of gravity upon an object
gravity
a force that pulls all objects toward each other
friction
a force that keeps objects that are touching each other from sliding past each other easily.