alleryStart learning →Which has more mass, a kilogram of cotton balls or a kilogram of gold?
AThe gold, since it is denser than cotton
BThe cotton, since it takes up more volume
CNeither, since the two masses are equal
DThe gold, since it weighs more on a scale
Answer & Solution
Correct answer: C. Neither, since the two masses are equal
1. A kilogram of one substance is equal in mass to a kilogram of another substance.
2. So the cotton and the gold have exactly the same mass.
3. What differs between them is volume and density, not mass.
4. Both would also weigh the same at the same place, since weight is mass times the gravitational acceleration.
_Source: OpenStax College Physics (CC BY 4.0), Ch 4 "Dynamics: Force and Newton's Laws of Motion", section 4.2 Newton's First Law of Motion: Inertia_
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