Racket frame and steam locomotive: what they have in common

1. Step 1. Racket frame — is part of — Tennis racket. The frame of the racket head.
2. Step 2. Tennis racket — is made of — Carbon fibre. Modern frames.
3. Step 3. Carbon fibre — is material for — Flywheel energy storage. The rotor is carbon fibre.
4. Step 4. Flywheel energy storage — has part — Flywheel. A flywheel.
5. Step 5. Flywheel — is part of — Watt steam engine. The flywheel evens out rotation.
6. Step 6. Watt steam engine — is part of — Steam locomotive. A steam locomotive is driven by a steam engine.

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