Violin bow and lathe: what they have in common

1. Step 1. Violin bow — is part of — Violin. The friction of horsehair excites the string.
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 — Lathe. The bowstring wraps around the workpiece and turns it.

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