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The SI unit of force is the newton, defined as the force needed to accelerate:
AA 1 kg mass at 9.8 m/s2
BA 1 kg mass at 10 m/s2
CA 1 kg mass at 1 m/s2
DA 1 g mass at 1 m/s2
Answer & Solution
Correct answer: C. A 1 kg mass at 1 m/s2
1. Units of force follow from the second law and the three base units.
2. Those base units are those for mass, length and time.
3. The SI unit of force is called the newton and is the force needed to accelerate a 1 kilogram system at the rate of one metre per second squared.
4. The 9.8 figure belongs to gravity, not to the definition of the unit.
_Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 4 'Dynamics: Force and Newton's Laws of Motion', sections 4.1-4.8_
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