The property of a body to remain at rest or to remain in motion with constant velocity is called inertia.
Newton's first law is often called the law of inertia.As we know from experience some objects have more inertia than others.It is obviously more difficult to change the motion of a larger boulder than that of basketball.For example the inertia of an object is measured by its mass.Mass can be determined by measuring how difficult an object is to accelerate.The more mass an object has,the harder it is to accelerate.
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