Violin sound post and archimedes’ screw: what they have in common

1. Step 1. Violin sound post — is part of — Violin. A sound post passes the vibrations to the back plate.
2. Step 2. Violin — uses — Friction. The bow sets the string vibrating by stick-slip friction.
3. Step 3. Friction — is used in — Flanged wheel. The wheel rolls along the rail.
4. Step 4. Flanged wheel — is part of — Steam locomotive. Flanged wheels keep it on the track.
5. Step 5. Steam locomotive — has part — Crank. Connecting rods and cranks carry the piston stroke to the wheels.
6. Step 6. Crank — is part of — Archimedes’ screw. A handle or rotary drive.

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