Orbits Are Continuous Free Fall

Lab Brief #2

🎯 Your mission

Run the experiment. Find out what really happens.

⚡ The twist

Gravity is invisible — but it shapes everything.

What you'll learn

A satellite in orbit is falling all the time; it simply moves sideways fast enough that it keeps missing the Earth. Astronauts float not because gravity is absent — at the space station it is about 90% of its surface value — but because they fall with their craft.

Key words

orbit
A closed path around a body, maintained by gravity acting as the centripetal force.
free fall
Motion under gravity alone, in which everything falls together and feels weightless.

Make a hypothesis first

Before you check: which is closer?

Say your guess out loud — then find out if you were right.

Get ready

🧰 What you need

strong bucket with handle
water
large open outdoor space

⚠️ Safety first

Outdoors only, well away from people and windows.
Check the handle and its fixing before every swing.

Step 1 of 4 · Read

Think about what you just learned: say what "orbit" and "free fall" mean in your own words before you start.

Step 2 of 4 · Do

Swing a bucket of water in a vertical circle fast enough that none spills, then slow it until it does. Relate the critical speed to the point where gravity alone can no longer supply the centripetal force.

Step 3 of 4 · Observe

Record what actually happened, including anything that did not match what you expected.

Step 4 of 4 · Record

Write a conclusion that answers the question this lesson opened with, and state your uncertainty.

Question 1 of 2

Astronauts on the space station float because they are:

How sure are you?😐 maybe

Question 2 of 2

The centripetal force keeping a satellite in orbit is provided by:

How sure are you?😐 maybe

Mind = blown

🌟 The light from the closest star (after the sun) takes 4 years to reach you.

Nice work!

You got 0 of 2 right.

Next: The Life Cycle of Stars All lessons

🎯

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✨ More to explore

🌍 Where you see this in real life: Every sunrise and every shadow is this idea in action.

🏆 Stretch challenge (try it this week): Look at the moon tonight. Notice its shape. Look again in 3 days.

👨‍👩‍👧 For the dinner table: “If you could visit any planet, which would you pick and why?”

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