A) Both inertia and force
B) Only inertia
C) Only force
D) Nothing
Correct Answer: A
Solution :
Newton's three laws of motion form a complete definition of force. The first law defines force qualitatively, the second law gives a quantitative measure of force and the third law tells us that the forces always exist in pairs. According to first law, force is that external agent which changes or tends to change the state of rest or of uniform motion of a body. The property of substances to remain at rest or in uniform motion unless acted upon by a force is called inertia. Thus a force overcomes inertia. For this reason the first law is also called law of inertia. Thus Newton's law defines both force and inertia.
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