Abacus beads and truck: what they have in common

1. Step 1. Abacus beads — is part of — Abacus. Movable beads — the places of a number.
2. Step 2. Abacus — has part — Wooden frame. A frame with rods.
3. Step 3. Wooden frame — is part of — Catapult. The base.
4. Step 4. Catapult — uses — Elasticity. A torsion catapult stored energy in twisted skeins.
5. Step 5. Elasticity — is used in — Leaf spring. The leaves bend and spring back.
6. Step 6. Leaf spring — is part of — Truck. Leaf-spring suspension.

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