In the S.I. system used in engineering mechanics, identify the correct base unit for force (as used in F = m * a).

Introduction / Context:
Force is one of the most fundamental quantities in mechanics. In the S.I. (International System of Units), consistent unit selection is crucial so that equations like F = m * a remain dimensionally correct and easy to apply across engineering problems ranging from structural analysis to fluid mechanics and machine design.

Given Data / Assumptions:

• The S.I. base unit of mass is kilogram (kg) and of length is metre (m).
• Acceleration is measured in m/s^2.
• Force is defined by Newton’s second law: F = m * a.
• Energy and work use different units than force, even though they are related concepts.

Concept / Approach:
From Newton’s second law, force must carry units kg * m/s^2. The S.I. assigns a special name to this derived unit: the newton (symbol N). One newton is the force required to accelerate a mass of 1 kg at 1 m/s^2. Distinguishing force (newton) from energy (joule) and mass (kilogram) prevents common dimensional mistakes in calculations and design checks.

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