If a bottle of water is shaken vigorously , will the internal energy ofthe water cgange?

Question

why or why not?

Answer 1

Yes, the internal energy will increase because the shaking transfers the work you are doing into internal motion of the water molecules. It's not because of "friction" between the water and the bottle's walls, as someone suggested. (That would only involve water sliding on the walls. It would be a very inefficient way of transferring energy.)

It's much more the direct agitation of those walls that adds kinetic energy to the individual molecules as they bounce off the walls, rather like a tennis player swinging a racket at a ball. As a consequence, the molecules move faster, with more kinetic energy than before. And, since temperature is a measure of the internal energy of a system, it will in fact rise slightly.

Your question calls to mind an interesting and extremely important historical precedent. Although it doesn't involve a closed bottle, it DOES illustrate the significance of impacting water with sufficient force:

Early in the 19th century, a certain young English manufacturer was very interested in matters of heat, work, and energy, both because he wanted to run his factories efficiently, and because, as a young scientist, he was also simply intrigued by these topics. It was really he who came to the realisation that there must be some "exchange rate" at which mechanical work was in fact converted into heat energy.

One consequence of those ideas was that water dropped from a great height should end up hotter than it started out, because of the kinetic energy it had on reaching whatever base it landed on in the end. He presumed that upon impact with the base, the kinetic energy of the water's essentially linear motion would be randomised into internal heat energy. That kinetic energy itself would of course have originally been gravitational potential energy, and so could be calculated if you knew the height through which it had fallen.

So, to test this idea, he took some assistants with him, and went tramping all over England and the Continent, looking for the highest waterfalls where he could then predict and test what the temperature increase should be. They obtained what are now recognized as classic results confirming his ideas. Not only was gravitational potential energy converted into kinetic energy (as already known), but that in turn was converted into heat energy!

By doing that, this man was able to calibrate the "mechanical equivalent of heat," among many other inter-relationships that he also found.

What was the man's name? : James Prescott Joule. He lived from 1818 - 1889. In 1839 he established that the various forms of energy (electrical, mechanical, and heat) are essentially the same and can be changed one into another. Note that date : he was only 21 when he made what was to prove one of the most important physical discoveries of all time! Following Joule, it became accepted that energy is never lost but is conserved. He showed us that even when it does appear to have been lost, it has simply been transformed into some other, perhaps not yet recognised form. The Conservation of Energy in ALL its forms, a principle so often quoted, was in fact first clearly enunciated by Joule.

And THAT is why the International System Unit of electrical, mechanical, and thermal energy is called "the Joule," in his honour.

The Joule is connected with other basic units in at least two ways. It's:

1. A unit of electrical energy equal to the work done when a current of one ampere is passed through a resistance of one ohm for one second ; and

2. A unit of energy equal to the work done when a force of one newton acts through a distance of one meter.

So you see, your idea about shaking your water bottle and increasing its internal energy has a very deep and most significant historical precedent!

Great question, by the way --- it led me to recall classes by an inspiring physics teacher who was a big fan of Joule's, some 50 - 55 years ago in England. Thank you for stirring those memories.

Live long and prosper.

Answer 2

Energy Water Bottle

Answer 3

Each type of energy can be converted to any other type.When U r shaking the bottle, the water molecules which contain either Kinetic or Potential energy, would b rubbed against the walls of da bottle. The energy stored in the molecules would b converted 2 heat energy and would be lost. Or, in the molecules which had no energy, heat energy would b stored.

Answer 4

Yes. The leading blenders, such as Vitamix, can actually boil water simply by the mechanical energy of the blades stirring the water

Answer 5

Yes. The friction between the bottle wall and the water will heat the water.

Answer 6

Yes, because you are adding energy to the system. When you set it down however, it returns to its original state.

Answer 7

I only see a tornado