Wooden soundboard and oil well: 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 — Rope. Twisted fibres hold each other by friction.
4. Step 4. Rope — is part of — Block and tackle. The rope runs around the pulleys.
5. Step 5. Block and tackle — is part of — Drilling rig. The block and tackle lifts the drill string.
6. Step 6. Drilling rig — is used in — Oil well. A well is drilled by a rig.

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