Rocking horse and steam locomotive: what they have in common

1. Step 1. Rocking horse — uses — Pendulum. Rocking.
2. Step 2. Pendulum — uses — Newton’s laws. The swing is described by Newtonian mechanics.
3. Step 3. Newton’s laws — is used in — Truss. A triangle is a rigid shape.
4. Step 4. Truss — is part of — Truss bridge. Trusses.
5. Step 5. Truss bridge — uses — Railway track. Railway bridges.
6. Step 6. Railway track — is used in — Steam locomotive. It runs on rails.

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