Zhang Heng’s seismoscope and turbojet engine: what they have in common

1. Step 1. Zhang Heng’s seismoscope — uses — Pendulum. An internal pendulum (according to reconstructions).
2. Step 2. Pendulum — uses — Newton’s laws. The swing is described by Newtonian mechanics.
3. Step 3. Newton’s laws — includes — Reaction force. Reaction is Newton’s third law.
4. Step 4. Reaction force — is used in — Turbojet engine. Thrust is the reaction of the jet.

Open Evothings