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Newtons First law of motion defines force and inertia. According to Newtons first law of motion, an external force must act on a body to bring about a change in the state of rest or uniform motion in a straight line. This leads us to define force.
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Force is that which changes or tends to change the state of rest or of uniform motion of a body in a straight line.
From first law itvis clear that a material body by itself is unable to change its state of rest or of uniform motion in a straight line. This inability of a body to change by itself its state of rest or state of uniform motion along a straight line is called Inertia of the body. Newton's first law defines inertia and hence it is described as law of inertia.
Quantitatively, mass is the measure of inertia.
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