🔬 Science · Forces & Motion
Mass vs Weight
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
Typical age: 11–12 years
“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?”
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- Universal GravitationREQUIRED
Universal gravity and orbital mechanics build directly on mass vs weight and the concept that gravitational field strength varies between planets
- Newton's First & Second Laws
Gravity (weight = mg) is the main worked example for Newton's laws — mass/weight distinction gives concrete numbers for F = ma