Violin sound post and rolling mill: 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 — Millstone. Grain is ground by friction between the stones.
4. Step 4. Millstone — is part of — Watermill. The wheel turns the millstones.
5. Step 5. Watermill — has part — Water wheel. A water wheel drives the mill’s mechanism.
6. Step 6. Water wheel — is used in — Rolling mill. The first mills were turned by water.

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