Grinding machine and kite: what they have in common

1. Step 1. Grinding machine — uses — Abrasive. An abrasive wheel.
2. Step 2. Abrasive — uses — Friction. Removing material by friction.
3. Step 3. Friction — is used in — Rope. Twisted fibres hold each other by friction.
4. Step 4. Rope — is part of — Kite. The line holds the kite and passes the tension to the hand.

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