User talk:Drusht

Welcome!

Hello, Drusht, and welcome to Wikipedia! I hope you like the place and decide to stay. Unfortunately, one or more of the pages you created, such as Draft:Job Times, may not conform to some of Wikipedia's guidelines, and may not be retained.

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Speedy deletion nomination of Draft:Job Times

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A tag has been placed on Draft:Job Times, requesting that it be speedily deleted from Wikipedia. This has been done under section G11 of the criteria for speedy deletion, because the page seems to be unambiguous advertising which only promotes a company, group, product, service, person, or point of view and would need to be fundamentally rewritten in order to become encyclopedic. Please read the guidelines on spam and Wikipedia:FAQ/Organizations for more information.

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Mechanical energy

HI Drusht! On 22 July 2020 you added some text to our article on Mechanical energy. Thanks for taking an interest in this article.

The text you added has mostly been removed because it was technically incorrect.

For example, under the heading Conservation of mechanical energy you wrote: A simple Examples of Conservation of mechanical energy would be as following: Rubbing your hands together converts mechanical energy to thermal energy. (See your diff.) Yes, rubbing your hands together converts mechanical energy to thermal energy, but that is not conservation of mechanical energy! Conservation of mechanical energy means the quantity of mechanical energy remains unchanged!
You wrote Turning on a light switch converts mechanical energy to electrical and radiant energy. If mechanical energy is converted to another form of energy, the amount of mechanical energy is reduced, not conserved!
You wrote Digesting food converts mechanical energy to chemical energy. Again, if mechanical energy is converted to another form, mechanical energy is not conserved.

These three examples illustrate Conservation of Energy, NOT conservation of mechanical energy. Energy is always conserved. Always! But conservation of mechanical energy is actually a rare event; it only occurs when friction (and other non-conservative forces) is/are zero, and that is rare.

To understand the principle of conservation of mechanical energy, consider a small object being dropped and allowed to fall freely in a vacuum. Before the object is dropped it has its maximum amount of potential energy, and its kinetic energy is zero. As it falls its potential energy reduces steadily and its kinetic energy increases steadily, but any reduction in one is exactly matched by an increase in the other so that the sum of the two, the mechanical energy of the object, remains unchanged. We say mechanical energy is conserved even though kinetic energy is increasing and potential energy is decreasing. When the object’s potential energy reaches zero its kinetic energy is exactly equal to the amount of potential energy it had before it was released and allowed to fall.

An object falling in a perfect vacuum is one example of a situation where mechanical energy is conserved. Another example is each planet moving in its orbit in its solar system; the only external forces acting on a planet (and a moon etc.) is gravity (its own weight) so a planet's kinetic energy will change, and its potential energy will change, but the sum of the two - its mechanical energy - remains constant because each change in one form of energy is exactly matched by an opposite change in the other form.

Happy editing. Dolphin (t) 11:56, 23 July 2020 (UTC)[reply]

Some of the text you inserted was supported by citing a page on The Mechanicals - see [1]. This page is too unreliable for use on Wikipedia. For example, it says rubbing your hands together converts mechanical energy to thermal energy and it describes this as an example of conservation of mechanical energy. Describing this action as conservation of mechanical energy is simply incorrect. Dolphin (t) 08:36, 24 July 2020 (UTC)[reply]