# Newton's First Law and Perpetual Motion

**URL:** <https://boards.straightdope.com/t/newtons-first-law-and-perpetual-motion/623977>\
**Category:** Factual Questions\
**Created:** [June 3, 2012, 11:58pm UTC](https://boards.straightdope.com/t/newtons-first-law-and-perpetual-motion/623977 "2012-06-03T23:58:34Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![njtt](https://avatars.discourse-cdn.com/v4/letter/n/ecd19e/32.png) [@njtt](https://boards.straightdope.com/u/njtt)\
**Post date:** [June 6, 2012, 2:37am UTC](https://boards.straightdope.com/t/newtons-first-law-and-perpetual-motion/623977/21 "2012-06-06T02:37:40Z")

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> [@am77494](#):
>
> As a followup question Chronos - does it happens instantly ? Or do conservation of energy follows the speed of light. That is if I add 1J energy to a cube of 3x10^8 m through one wall - and measure the energy in the cube - is the energy in the cube instantly increased by 1J ?

You asking whether something is in a box as soon as it is in the box.

The answer is clearly _yes_, as a simple matter of logic.

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