Wooden frame and tank: what they have in common

1. Step 1. Wooden frame — is part of — Catapult. The base.
2. Step 2. Catapult — uses — Elasticity. A torsion catapult stored energy in twisted skeins.
3. Step 3. Elasticity — is used in — Torsion bar suspension. It works in torsion.
4. Step 4. Torsion bar suspension — is part of — Tank. The road wheels of many tanks are sprung on torsion bars.

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