Mass
How much stuff is in a thing, measured in grams and kilograms. Weight is how hard a planet pulls on that stuff: on the Moon your weight changes, but your mass doesn't.
Depth 1 · Foundation
You know what mass is, use grams and kilograms, and know how the kilogram was defined.
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- 1
Foundation
You know what mass is, use grams and kilograms, and know how the kilogram was defined.
- 2
Deeper
You can tell mass from weight, and explain why you would weigh less on the Moon but have the same mass.
Master depth 1 first
Your path here
What's still between you and Mass, depth 1, in the order you can learn it.