Question 1

What is the difference between mass and weight?

Accepted Answer

Mass is amount of matter (kg). Weight is gravitational force (newtons). On Earth, 1 kg mass weighs 9.8 N.

Question 2

Does my mass change on the Moon?

Accepted Answer

No, mass stays the same. Weight decreases to 1/6 because Moon's gravity is weaker. 60 kg person weighs 10 kg-force on Moon.

Question 3

Is there a difference between mass and weight?

Accepted Answer

Yes! Mass (kg) is amount of matter, constant everywhere. Weight (newtons or pounds-force) is gravitational force on mass, varies by location.

Question 4

Why do jewelry and precious metals use different units?

Accepted Answer

Troy system (troy ounces, pennyweights) has been used for precious metals since the Middle Ages. 1 troy oz = 31.1g vs 1 regular oz = 28.35g.

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