Mission: The Gravity Detective — Level 5
Akuuu drops a feather and a rock from the same height.
Her brother says: “The rock lands first because it’s heavier. Gravity pulls harder on heavy things!”
Her sister says: “On the Moon, an astronaut dropped a hammer and a feather — they landed at the same time!”
👉 Who is right? Does gravity care about weight? Why does the feather fall slower on Earth?
Think: If gravity pulls harder on heavy things, why don’t they fall faster? What else is happening to the feather that isn’t happening to the rock?
✏️ Draw or describe what you think is really happening:
- 🌍 Gravity pulls all objects toward Earth’s center at the same rate — about 9.8 m/s² faster every second
- ⚖️ Mass = how much stuff an object has (kg). Weight = gravity pulling on that mass (N). More mass = more weight, but NOT faster falling
- 💨 Air resistance pushes against falling objects. Light, wide objects (feathers, paper) feel it more than heavy, narrow ones (rocks, bullets)
Akuuu weighs 30 kg on Earth. The Moon’s gravity is 1/6 of Earth’s.
👉 What is her mass on the Moon? What is her weight? Does she fall slower or faster there?
Akuuu imagines a vacuum chamber — a box with no air inside.
She drops a bowling ball and a marshmallow at the same time.
👉 What happens? Then she repeats this on Jupiter (stronger gravity) and Pluto (weaker gravity). What changes? What stays the same?
👉 Why do astronauts float in the Space Station if gravity still pulls on them?
Akuuu designs a parachute for a toy astronaut. She tests three designs from the same height:
A: Small plastic bag — lands in 3 seconds
B: Large plastic bag — lands in 6 seconds
C: Large paper bag — lands in 5 seconds
👉 Which design works best? What two factors are competing here? Explain using gravity and air resistance.
A child says: “Gravity doesn’t exist in space. That’s why astronauts float. If there was gravity, they’d fall down!”
👉 What is wrong? Use the Space Station’s orbit (400 km above Earth) to explain why astronauts still experience gravity but don’t fall.
Akuuu wants to prove that mass doesn’t affect falling speed — but she only has a classroom, not a vacuum chamber.
👉 Design an experiment using everyday objects that minimizes air resistance. What would you drop? How would you make it fair? What result proves your point?
🧠 Part A — Transfer
Akuuu visits a planet where gravity is 2× Earth’s. She drops a rock and a feather in the planet’s thin atmosphere (almost no air).
👉 Predict: What happens? Then she throws both objects sideways at 100 km/h. One orbits the planet. One crashes. Which is which? Why?
Think: Orbiting is just falling sideways so fast that you keep missing the ground. What does the feather need to orbit? What does the rock already have?
🧠 Part B — Thinking Pause
- I separated gravity from air resistance in my explanations
- I spotted the misconception about “no gravity in space”
- I connected falling to orbiting using the same principle
⭐ Mission Reflection
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