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Opening A Stuck Jar Lid

Classical Mechanics Level 1

A common solution to open a stuck jar lid is to hold it under warm, running water. Why does this method work?

The glass jar contracts more than the metal lid. Water flows into the gap between the lid and the jar, and decreases the friction between them. The metal lid expands more than the glass jar.

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Excel in math and science

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by Pranshu Gaba

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