Billiard table cushions and cannon: what they have in common

1. Step 1. Billiard table cushions — is part of — Billiards. Rubber cushions bounce the balls back.
2. Step 2. Billiards — uses — Newton’s laws. Collisions of balls.
3. Step 3. Newton’s laws — includes — Universal gravitation. Part of Newtonian mechanics.
4. Step 4. Universal gravitation — is used in — Mortar (weapon). The bomb flies on a steep trajectory.
5. Step 5. Mortar (weapon) — is a kind of — Cannon. A gun.

Open Evothings