Q:

# What is resistance to change in motion?

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Resistance to change in motion is called inertia. The amount of inertia in an object is directly proportional to its mass; an object with greater mass has more inertia than an object with less mass.

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Sir Isaac Newton's First Law of Motion, also called the "Law of Inertia," states that an object at rest stays at rest, and a moving object remains moving unless an outside force acts on the object. An object currently in motion does not come to a stop unless a force counteracts the motion; this force could be friction of the object against a surface or air resistance. An object can have several forces acting on it at one time, but the object only changes its motion if a net force exists.

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