Dumbbell bar and cannon: what they have in common

1. Step 1. Dumbbell bar — is part of — Dumbbell. A steel rod that serves as a handle.
2. Step 2. Dumbbell — uses — Universal gravitation. Weight.
3. Step 3. Universal gravitation — is used in — Mortar (weapon). The bomb flies on a steep trajectory.
4. Step 4. Mortar (weapon) — is a kind of — Cannon. A gun.

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