Boomerang and radio: what they have in common

1. Step 1. Boomerang — uses — Angular momentum. Gyroscopic precession brings the boomerang back.
2. Step 2. Angular momentum — is used in — Reaction wheel. Conservation of angular momentum.
3. Step 3. Reaction wheel — is part of — Artificial satellite. Attitude control.
4. Step 4. Artificial satellite — includes — Sputnik 1. The first satellite.
5. Step 5. Sputnik 1 — has part — Radio. It sent out a “beep-beep” radio signal.

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