A place or object used for comparison to determine if an object is in motion

An object at rest will stay at rest, and an object in motion will stay in motion, unless acted on by an unbalanced force.

describes motion produced by unbalanced forces (Force= mass X acceleration)

For every action there is an equal and opposite reaction

The tendency of an object to resist a change in motion

The rate at which velocity changes

the speed of an object in a particular direction

The experimental factor that is manipulated; the variable whose effect is being studied.

The action and reaction pair of forces that occur in an interaction.

Forces that produce a nonzero net force, which changes an object's motion

forces acting on an object that combine and form a net force of zero

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