Catapult and multistage rocket: what they have in common

1. Step 1. Catapult — uses — Elasticity. A torsion catapult stored energy in twisted skeins.
2. Step 2. Elasticity — is used in — Beam. Bending.
3. Step 3. Beam — is part of — Truss. Members.
4. Step 4. Truss — uses — Newton’s laws. A triangle is a rigid shape.
5. Step 5. Newton’s laws — is used in — Tsiolkovsky rocket equation. It follows from the conservation of momentum.
6. Step 6. Tsiolkovsky rocket equation — is used in — Multistage rocket. Tsiolkovsky justified “rocket trains”.

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