Billiard pockets and boyle’s air pump: what they have in common

1. Step 1. Billiard pockets — is part of — Billiards. Mesh pockets.
2. Step 2. Billiards — uses — Newton’s laws. Collisions of balls.
3. Step 3. Newton’s laws — is used in — Seat belt. It restrains the body during sudden braking.
4. Step 4. Seat belt — is part of — Car. Seat belts.
5. Step 5. Car — has part — Rack and pinion. The steering gear is a rack and pinion.
6. Step 6. Rack and pinion — is part of — Boyle’s air pump. A rack and pinion moves the piston.

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