File and LIGO: what they have in common

1. Step 1. File — uses — Friction. Material is removed by the friction of the teeth.
2. Step 2. Friction — is used in — Ball bearing. A bearing replaces sliding friction with far lower rolling friction.
3. Step 3. Ball bearing — is part of — Base isolation. Friction pendulum bearings.
4. Step 4. Base isolation — is part of — LIGO. The suspension damps ground vibrations.

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