Reaction force and barrel: what they have in common

1. Step 1. Reaction force — is a kind of — Newton’s laws. Reaction is Newton’s third law.
2. Step 2. Newton’s laws — is used in — Truss. A triangle is a rigid shape.
3. Step 3. Truss — is part of — Truss bridge. Trusses.
4. Step 4. Truss bridge — is a kind of — Bridge. A bridge.
5. Step 5. Bridge — has part — Arch. Stone bridges were built as arches.
6. Step 6. Arch — works like — Barrel. Staves squeezed by hoops hold their shape by the same compression as the stones of an arch.

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