Rocking horse rockers and oil well: what they have in common

1. Step 1. Rocking horse rockers — is part of — Rocking horse. Curved supports for rocking.
2. Step 2. Rocking horse — uses — Pendulum. Rocking.
3. Step 3. Pendulum — uses — Newton’s laws. The swing is described by Newtonian mechanics.
4. Step 4. Newton’s laws — is used in — Truss. A triangle is a rigid shape.
5. Step 5. Truss — is made of — Wrought iron. Then — wrought iron.
6. Step 6. Wrought iron — is material for — Oil well. The casing pipes are iron.

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