Carved wooden horse and tank: what they have in common

1. Step 1. Carved wooden horse — is part of — Rocking horse. A saddle-shaped body.
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 — includes — Reaction force. Reaction is Newton’s third law.
5. Step 5. Reaction force — is used in — Machine gun. Recoil energy reloads the weapon.
6. Step 6. Machine gun — is part of — Tank. The Mark I’s machine guns.

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