Rocking horse rockers and knife: 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 — is part of — Seismograph. An inertial mass.
4. Step 4. Seismograph — is made of — Bronze. Zhang Heng’s seismoscope is a bronze vessel.
5. Step 5. Bronze — is material for — Cutlery. Ancient spoons and knives were bronze.
6. Step 6. Cutlery — has part — Knife. Knives.

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