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# Mini-Quiz: Density of Matter

by Ron Kurtus

Take this Mini-Quiz to check your understanding of the lesson material.

1. Given the density and volume of a material, how do you find its mass?

Multiply the density times the volume: m = ρV

Divide the density by the volume: m = ρ/V

You cannot find the mass unless you weigh the object

2. Why is the density of water equal to 1 g/cm3?

It just happened to equal 1

Because there is more water than other materials

The size of the units were defined so that water density would equal 1

3. Under the same conditions, is the density of lead the same on the Moon as it is on Earth?

Yes, because the mass is the same in both places

It is unknown, because there is no lead on the Moon

No, because the Earth has stronger gravity than the Moon

If you got all three correct, you are on your way to becoming a Champion in Physics. If you had problems, you had better look over the material again.

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