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To: William Tell
Please excuse my ignorance, but are you saying that, for example the strong force, it is the transfer of particles within the atom that holds the atom together? If these particles are being exchanged, is there not still a "force" involved? With your example of the two men on the ice, they were still using "energy" to throw the balls (particles). What is the manifistation of this "energy" for subatomic particles?
Thanks!
Doug
143 posted on 11/17/2003 5:21:34 AM PST by Merdoug
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To: Merdoug
Merdoug asks: ..."are you saying that, for example the strong force, it is the transfer of particles within the atom that holds the atom together? If these particles are being exchanged, is there not still a "force" involved? With your example of the two men on the ice, they were still using "energy" to throw the balls (particles). What is the manifistation of this "energy" for subatomic particles?

First a disclaimer. I can handle the men on platforms throwing a ball. The physics of nuclear forces is a topic with which I have a very dated, limited exposure.

The way I would answer your question is that "force" is simply the description we give to describe when things are interacting. If one particle moves toward another and the second particle changes its behavior, then we describe the second particle as having been "forced" to change its behavior. The laws of physics describe in detail how the behavior will change.

In common usage, the word "force" tends to imply that a person could sense pressure or pain or some other manifestation of one object interacting with another. Physiologically, these sensations are just our own bodies or senses being interacted with and changing their behavior due to some other object.

The detailed behavior of the universe, whether we like it or not and whether it appeals to our intuition, is that "forces" in the physical world require time to elapse before the cause can create the effect.

A flare on the surface of the sun cannot be sensed on earth until about eight minutes after the event happens on the sun. Any effect on the earth is due to "radiation", either electromagnetic or particles, reaching the earth. ( The particles taking much longer than the electromagnetic radiation.)

The electromagnetic radiation will arrive at the earth in the form of what we call "light". Experiments have shown that light is "quantized"; that is, any photon of a given frequency carries a specific amount of energy.

One of Einstein's contributions was the understanding of the photo-electric effect. Shining a light on a piece of metal reveals that the energy of each emiitted electron from the metal is a function of the frequency of the light and not the intensity of the light. The experiment is consistent with the understanding that the light consists of "photons" each of which is capable of causing the emission of a single electron. Thus, any force caused by the distant movement of electrically charged particles can be demonstrated to have effect through the actions of photons moving at the speed of light from the source of the energy to its recipient.

The nuclear force is theorized to operate similarly. Interaction between particles which exhibit the strong force do so by exchanging particles to convey energy and momentum.

The "graviton" is the presumed particle which plays the role of conveying energy and momentum from one mass interacting with some other mass through the gravitational force. The force of gravity is much, much weaker than the other forces and efforts to detect gravitons have not yet been successful (last I heard).

In summary, the answer to the question would be "yes", all forces involve the exchange of particles. At the finest level, everything which causes "free space" not to be empty seems to have a description which involves both wave and particle properties. The interactions between them are what constitute the activity in our universe.

147 posted on 11/17/2003 11:07:47 AM PST by William Tell
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