Wooden soundboard and tunnelling shield: what they have in common

1. Step 1. Wooden soundboard — is part of — Violin. The top and back plates of the body.
2. Step 2. Violin — uses — Friction. The bow sets the string vibrating by stick-slip friction.
3. Step 3. Friction — is used in — Pallet. The load is held on the deck by friction.
4. Step 4. Pallet — is used in — Forklift. It works with pallets.
5. Step 5. Forklift — has part — Hydraulic cylinder. Lifting the forks.
6. Step 6. Hydraulic cylinder — is used in — Tunnelling shield. The shield was pushed forward by jacks.

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