Friction and aerosol can: what they have in common

1. Step 1. Friction — is used in — Ladder. The feet hold on the floor by friction.
2. Step 2. Ladder — is part of — Fire truck. An extending ladder.
3. Step 3. Fire truck — uses — Fire hydrant. Connection.
4. Step 4. Fire hydrant — has part — Valve. A gate valve.
5. Step 5. Valve — is part of — Aerosol can. A valve.

Open Evothings