580 Jonson — The Law of Dissipation of Motion. 



The possible relations of magnitude which may exist 

 between AB and BC are infinite. Hence, the probability 

 that these two momenta are equal is one divided by 

 infinity, i. e., zero. In every actual transmission of 

 momentum the initial momenta must be regarded as dif- 



Fig. 2. 



fering in magnitude, and, as has been previously shown, 

 as not coincident in their paths. Hence, it must be con- 

 cluded that in every actual transmission of momentum 

 the difference in momentum is decreased, which means 

 that momentum or motion is dissipated. The Law of 

 Dissipation of Motion accordingly may be formulated as 

 follows — every transmission of motion through collision 

 is attended with a dissipation of motion. 



Energy has two phases, energy of motion and energy 

 of position. - In a collision motion only is transmitted. 

 However it is highly probable that all transmission of 

 molecular energy occurs through a transmission of 

 motion through collision. If this assumption be granted 

 the Law of Dissipation of Energy has been explained 

 mechanically. The foregoing study of the problem of 

 collision makes it clear how energy dissipates itself, and 

 why energy is never concentrated as a result of physical 

 process. 



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