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Which of these statements about weight or mass is correct?
  • A
    The mass of an object is independent of the acceleration due to gravity.
  • B
    The weight of an object is independent of the acceleration due to gravity.
  • C
    In the SI system the unit of measurement for weight is the kilogram.
  • D
    Mass = weight × volume.

Mass is typically defined as the amount of matter within an object. The SI unit of mass is the kilogram (kg).
Mass is constant regardless of gravity, but weight is not. Weight it the force exerted on a body by gravity:

W = m x g [N] ⇔ m = W ÷ g

Where g is gravitational acceleration.

g ≈ 9.81 m/s2 on Earth
W ≈ m x 9.81

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