Wooden pencil casing and rope: what they have in common

1. Step 1. Wooden pencil casing — is part of — Pencil. A cedar or lime-wood casing.
2. Step 2. Pencil — uses — Eraser. Erasing.
3. Step 3. Eraser — uses — Friction. It removes graphite by friction.
4. Step 4. Friction — is used in — Rope. Twisted fibres hold each other by friction.

Open Evothings