Understanding kinetic energy

[aleks]

I have a question I have never found answer to.

You all know what a kinetic energy of a physical body is: it depends on the mass and body's velocity vector.

However, what makes me wonder is HOW the kinetic energy is stored in body if we think of the body as a body consisting of particles that have 'state'. So, each particle's average kinetic (and vectorial) energy will depend on the body's energy divided by the number of particles. Hopefully this is correct and reasonable.

Now, if I give this body a spin (this will require a throw of a bit of mass in direction perpendicular to the velocity vector), particles within this body will start to rotate together with the body.

But why then average energy of these particles will still be pointing towards the original direction (when the body was not spinning)? Does this mean that energy of the body IS NOT stored in the particles as their state variable? Otherwise we could easily put any body into zig-zag motion without even throwing away mass from the body.

Something is definitely absent in modern physics.

[supersam]

aleks,

you might want tto look at the physics of a curve ball.  i keep tring to understand them for i believe like p-motion, that this might be a clue.  i just can't seem to get out of my three dimentional frame of thinking.  but, is it neccessary?


lol
sam

[aleks]

aleks,

you might want tto look at the physics of a curve ball.  i keep tring to understand them for i believe like p-motion, that this might be a clue.  i just can't seem to get out of my three dimentional frame of thinking.  but, is it neccessary?


lol
sam

Thanks for the tip. But what kind of physics is that? I guess it is related to non-linear hydro/aerodynamics? Then fun is here: http://www.grc.nasa.gov/WWW/K-12/airplane/foil2b.html

But this does not give me answers about HOW body's kinetic energy retains its direction while its particles are rotating. The paradox is, if you take a single particle, its velocity vector spins, but if you take a body, single particle's velocity vector stays unchanged.

The idea I'm currently having about this is that kinetic energy can be seen as an area of aether's compression that surrounds body. So, when you are giving a kick to the body you are compressing aether: the stronger you kick, the higher the compression of aether is.

If aether is considered, a paradox I see can be resolved while body's spinning motion contributes to a more complex aether compression setup building up around the body.

[fletcher]

A body in motion has Total Kinetic Energy - it is made up of two components - Rotational KE & Translational KE - they sum to Total KE - this means that whatever the mix [spinning or not] & relative velocity of the body, the body's Momentum is the same - Momentum is expressed as a vector quantity unit [magnitude & direction] but is really a measure of a body's scalar Total KE.

Have a hunt around the index for Energy in the web site below

http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html

[aleks]

A body in motion has Total Kinetic Energy - it is made up of two components - Rotational KE & Translational KE - they sum to Total KE - this means that whatever the mix [spinning or not] & relative velocity of the body, the body's Momentum is the same - Momentum is expressed as a vector quantity unit [magnitude & direction] but is really a measure of a body's scalar Total KE.

Have a hunt around the index for Energy in the web site below

http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html

OK, but if we go down to atoms, how this translates to atoms?