Mass as a Scalar Quantity in Physics

Steps:

• Recall that mass measures the amount of matter in an object and is independent of direction.
• Identify mass as a scalar because it has magnitude only, no direction, unlike vectors like force.
• Note the SI unit for mass is the kilogram (kg), as defined by the International System of Units.
• Compare options: A matches scalar and kg; others mismatch on type or unit.

Why A is correct:

• Mass is defined in physics as a scalar quantity representing inertia or matter amount, with the SI unit kilogram per the fundamental standards.

Why the others are wrong:

• B: Newton is the unit for force, not mass.
• C: Mass lacks direction, so it is not a vector.
• D: Mass is scalar, not vector, and newton measures force.

Final answer: A