Bobsleigh and cannon: what they have in common

1. Step 1. Bobsleigh — uses — Friction. Speed is kept up by the low friction of ice.
2. Step 2. Friction — is used in — Flintlock. A spark from a strike of flint.
3. Step 3. Flintlock — is part of — Musket. A flintlock.
4. Step 4. Musket — evolved from — Hand cannon. A hand-held gun.
5. Step 5. Hand cannon — evolved into — Cannon. A large hand cannon.

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