alleryThe SI unit of force, the newton, is defined as the force that:
AProduces 1 m of displacement on a 1 kg mass
BAccelerates a 1 kg mass at 1 m s⁻²
CActs on a 1 kg mass for 1 second
DStops a 1 kg mass moving at 1 m s⁻¹
Answer & Solution
Correct answer: B. Accelerates a 1 kg mass at 1 m s⁻²
1. From F = ma, setting m = 1 kg and a = 1 m s⁻² gives F = 1 N.
2. So one newton is the force needed to give a 1 kg mass an acceleration of 1 m s⁻².
3. Dimensionally, 1 N = 1 kg·m·s⁻².
_Source: syllabus Physics Ch 4 "Laws of Motion", §4.5 Newton's Second Law, p. 54_
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