Mon Prof Augmenté
Same Mass, Different Weight
Age 14 · Physics
Weight is the force of gravity on an object, found with P = m × g. Because the Moon’s gravity is about one sixth of Earth’s, the same mass weighs about one sixth as much there.
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In the picture
- Left steel ball: same mass as the right ball
- Left spring coil: stretched long by Earth’s gravity
- Right steel ball: same mass as the left ball
- Right spring coil: stretched short by the Moon’s weaker gravity
Examples
- An astronaut has the same mass on Earth and on the Moon, but weighs about one sixth as much on the Moon.
- A bag of rice has the same mass in a shop and on a mountain, while its weight changes slightly with gravity.
Key takeaways
- Mass is measured in kilograms and stays the same in different places.
- Weight is a force measured in newtons and depends on the local gravity.
Quiz: Same Mass, Different Weight (Age 14)
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Which statement about mass is correct?
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According to the card, what is weight?
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If the same mass is taken from Earth to the Moon, what happens to its weight?
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