Wooden plank and boyle’s air pump: what they have in common

1. Step 1. Wooden plank — is material for — Baseball bat. Ash or maple.
2. Step 2. Baseball bat — has part — Handle. A thin handle.
3. Step 3. Handle — is part of — Screwdriver. A handle.
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.

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