Metal construction set and boyle’s air pump: what they have in common

1. Step 1. Metal construction set — has part — Bolt and nut. Screws and nuts.
2. Step 2. Bolt and nut — has part — Screw thread. A bolt and a nut are joined by a thread.
3. Step 3. Screw thread — is used in — Screwdriver. It drives screws.
4. Step 4. Screwdriver — uses — Torque. The handle creates torque.
5. Step 5. Torque — is used in — Rack and pinion. The rotation of the pinion becomes the travel of the rack.
6. Step 6. Rack and pinion — is part of — Boyle’s air pump. A rack and pinion moves the piston.

Open Evothings