Grinding machine and bicycle: 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 — Bicycle brake. Pads press against the rim or disc and shed speed through friction.
4. Step 4. Bicycle brake — is part of — Bicycle. Brakes stop the bicycle.

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