Mass of Proton and Quarks
Why is a proton heavier than the sum of its parts?
When the parts, the quarks, move together, they start with a large potential
energy. As they move closer together, this energy changes form. Sometimes
the energy becomes mass: E=mc^2. Sometimes the energy becomes kinetic
energy and the quarks do not stick together.
Dr. Ken Mellendorf
Illinois Central College
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Update: June 2012