# Simple physics question

**URL:** <https://boards.straightdope.com/t/simple-physics-question/852363>\
**Category:** Factual Questions\
**Created:** [April 22, 2020, 5:45pm UTC](https://boards.straightdope.com/t/simple-physics-question/852363 "2020-04-22T17:45:29Z")\
**Posts on this page:** 1\
**Page:** 4

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**Author:** ![Chronos](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/chronos/32/134_2.png) [@Chronos](https://boards.straightdope.com/u/Chronos)\
**Post date:** [April 24, 2020, 9:09pm UTC](https://boards.straightdope.com/t/simple-physics-question/852363/62 "2020-04-24T21:09:44Z")

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What? Of course friction does work. It changes the energy of the box, doesn’t it?

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