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week1 (dragged) 9

week1 (dragged) 9 - • Gravity graviton(has not been...

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4 The Four Forces ! The four fundamental forces work by exchanging elementary particles (not necessarily “real”, might be “virtual”). Electromagnetic - photon Weak - W and Z bosons (observed in 1983) Strong – gluons (observed in 1979)
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Unformatted text preview: • Gravity - graviton (?) (has not been observed yet) ! Thus forces can act at a distance ! The Sun attracts the Earth from distance • Magnet can attract metal • Electric charges attract each other Thursday, August 26, 2010...
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