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Planetary Weight Calculations
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Planetary Weight Calculations
Use the gravity values shown below. To estimate weight on another world, multiply Earth weight by (that world’s gravity ÷ Earth’s gravity). Round calculated weights to the nearest tenth of a pound.
Gravity, Mass, and Weight
1.What force helps keep planets moving in their paths around the Sun?
- Friction between the planets and space
- The Sun’s gravitational attraction
- Earth’s magnetic field
- The planets’ own light
2.A rover has a mass of 72 kilograms on Earth. What is its mass on Mars?
- About 27 kilograms
- 72 kilograms
- About 194 kilograms
- It cannot have mass on Mars
3.Which statement correctly compares mass and weight?
- Mass changes with location, while weight stays fixed.
- Mass and weight are two names for the same measurement.
- Mass stays the same, while weight depends on local gravity.
- Both mass and weight always stay the same.
4.Match each world to its approximate gravitational acceleration.
- Earth
- Mars
- Jupiter
- Moon
- 9.8 m/s²
- 24.8 m/s²
- 3.7 m/s²
- 1.6 m/s²
5.In one sentence, explain why an object’s weight is different on Mars than on Earth.
Calculate Weight on Other Worlds
Use these approximate values: Earth = 9.8 m/s²; Mars = 3.7 m/s²; Jupiter = 24.8 m/s²; Moon = 1.6 m/s².
6.An object weighs 98 pounds on Earth. Estimate its weight on Mars. Show your calculation using (Mars gravity ÷ Earth gravity) × Earth weight.
7.A science instrument weighs 64 pounds on Earth. Estimate its weight on Jupiter and on the Moon. Show both calculations.
8.A 150-pound explorer travels to Mars, Jupiter, and the Moon. Estimate the explorer’s weight at each destination using the given gravity values.
9.Using the gravity values provided, identify where a person would weigh the most and the least. Explain how gravity supports your choices.
10.A supply crate weighs 84 pounds on Earth. Estimate its weight on Mars. Based on the result, would lifting it there require less or more force than on Earth? Explain.
11.Imagine a planet where gravitational acceleration is twice Earth’s 9.8 m/s². What is the planet’s gravity, and how would an object’s weight there compare with its Earth weight?
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