Qualitative vs. Quantitative: Newton's First Law describes the property of inertia and qualitatively defines force as the agent that changes the state of rest or uniform motion.
Second Law Definition: Newton's Second Law states that the rate of change of momentum of a body is directly proportional to the applied force and takes place in the direction in which the force acts (F∝dtdp).
Measure of Force: This law establishes the quantitative relationship F=ma (where k=1 in SI units). Thus, it provides the formula to calculate (measure) the magnitude of force required to produce a specific acceleration in a given mass [Source 59, 70, 71].
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