Newton’s First Law

Newton’s First Law: An object in motion will remain in motion at a constant velocity, unless acted on by an unbalanced force.

What this means: If all of the forces on an object balance (a state called equilibrium) the object will move at a constant speed and direction. (The speed may be zero, but does not have to be.) Therefore, equilibrium = no unbalanced force = constant speed. 

Inertia: Inertia is an object’s resistance to a change in speed. Inertia is equivalent to an object’s mass.


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