Violin sound post and sewage treatment plant: what they have in common

1. Step 1. Violin sound post — is part of — Violin. A sound post passes the vibrations to the back plate.
2. Step 2. Violin — uses — Friction. The bow sets the string vibrating by stick-slip friction.
3. Step 3. Friction — is used in — Air brake. Brake shoes slow the wheels through friction.
4. Step 4. Air brake — has part — Compressor. A compressor pumps the air.
5. Step 5. Compressor — is part of — Sewage treatment plant. Blowers supply oxygen to the microbes.

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