Protective roof and pneumatic tube: what they have in common

1. Step 1. Protective roof — is part of — Battering ram. A roof that protects the crew.
2. Step 2. Battering ram — uses — Newton’s laws. The momentum of a heavy log.
3. Step 3. Newton’s laws — includes — Reaction force. Reaction is Newton’s third law.
4. Step 4. Reaction force — is used in — Ramjet. Jet thrust.
5. Step 5. Ramjet — uses — Compressed air. The air is compressed by the oncoming flow.
6. Step 6. Compressed air — is used in — Pneumatic tube. Air pressure.

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