Kepler’s laws and tank: what they have in common

1. Step 1. Kepler’s laws — evolved into — Universal gravitation. Newton derived gravitation from Kepler’s laws.
2. Step 2. Universal gravitation — is used in — Mortar (weapon). The bomb flies on a steep trajectory.
3. Step 3. Mortar (weapon) — evolved from — Howitzer. High-angle fire.
4. Step 4. Howitzer — has part — Recoil mechanism. Recoil mechanisms.
5. Step 5. Recoil mechanism — is part of — Tank gun. Recoil mechanisms.
6. Step 6. Tank gun — is part of — Tank. A gun in a rotating turret.

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