How can you tell they’ve got it: Mass vs Weight?

If they’ve got it, you’ll see things like: Explains the difference between mass and weight with correct units for each; Calculates weight using W = mg with g = 10 N/kg on Earth; Predicts what would happen to an object's weight on the Moon or Jupiter; Explains why mass stays constant but weight changes in different gravitational fields. Or just try it together: If your child weighed themselves on bathroom scales and was then asked what they would weigh on the Moon, could they explain the difference between mass and weight and work out a rough answer?

Science Forces & Motion Ages 11–12

Mass vs Weight

Your child knows mass is how much stuff is in a thing, and weight is the pull of gravity on it. Your mass stays the same on the Moon, but you weigh less.

In curriculum terms

Distinguish between mass (amount of matter, measured in kg) and weight (gravitational force, measured in N), use the equation weight = mass × gravitational field strength, and explain why g differs on other planets and stars

Ages are typical, not deadlines — follow your child’s pace. How to help at home →

How to tell they’ve got it

Tick these off as you see them — no test required.

Explains the difference between mass and weight with correct units for each
Calculates weight using W = mg with g = 10 N/kg on Earth
Predicts what would happen to an object's weight on the Moon or Jupiter
Explains why mass stays constant but weight changes in different gravitational fields

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Try this together

If your child weighed themselves on bathroom scales and was then asked what they would weigh on the Moon, could they explain the difference between mass and weight and work out a rough answer?

Where this sits on the map

Stuck here? Check the skills it builds on first. Confident? Here’s what it unlocks.

Builds on

Gravity & Falling Objectsages 9–11KS3 weight = mass × g extends KS2 introduction to gravity as the force pulling objects toward Earth

Mass vs Weightthis skill · ages 11–12

Unlocks

Universal Gravitationages 12–13Universal gravity and orbital mechanics build directly on mass vs weight and the concept that gravitational field strength varies between planets

Newton's First & Second Lawsages 12–13Gravity (weight = mg) is the main worked example for Newton's laws — mass/weight distinction gives concrete numbers for F = ma

solid = must come firstdashed = helps

Curriculum alignment

Where this fits in the official school curriculum — our best automated guess, not yet checked by a person.

This skill sits outside the F–6 Australian Curriculum — no candidate code matched (v0.1). No NSW K–6 outcome code matched (v0.1). No Victorian Curriculum 2.0 code matched (v0.1).

Nearby on the map

Magnetic Fieldsages 11–12 Relative Motionages 11–12 Resultant Forcesages 11–12 Speed & Distance-Time Graphsages 11–12

All Forces & Motion skills →