Sled runners and fuel cell: what they have in common

1. Step 1. Sled runners — is part of — Sledge. They glide over the snow.
2. Step 2. Sledge — uses — Friction. Low friction of the runners on snow.
3. Step 3. Friction — is used in — Car brake. Pads press against the disc and shed speed through friction.
4. Step 4. Car brake — is part of — Electric car. Besides regeneration, ordinary friction brakes are needed.
5. Step 5. Electric car — includes — Hydrogen car. A hydrogen-powered electric car.
6. Step 6. Hydrogen car — has part — Fuel cell. A fuel cell.

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