Electrostatic machine and knife: what they have in common

1. Step 1. Electrostatic machine — uses — Friction. Friction.
2. Step 2. Friction — is used in — File. Material is removed by the friction of the teeth.
3. Step 3. File — has part — Tang. The end for the handle.
4. Step 4. Tang — is part of — Knife. The part of the blade fixed in the handle.

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