Metal rod with knob and lathe: what they have in common

1. Step 1. Metal rod with knob — is part of — Electroscope. It conducts the charge.
2. Step 2. Electroscope — uses — Static electricity. The leaves repel each other.
3. Step 3. Static electricity — is used in — Electrostatic machine. Charging by friction.
4. Step 4. Electrostatic machine — uses — Friction. Friction.
5. Step 5. Friction — is used in — Rope. Twisted fibres hold each other by friction.
6. Step 6. Rope — is part of — Lathe. The bowstring wraps around the workpiece and turns it.

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