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To this law was properly understood, should providea few examples. Upon impact of one body on another that we commonlycalled effect, is to change the position or motion of one orboth the bodies But one a moment of reflection will show us how thoughtless and incompletesuch a view of things. Besides the visible mechanical result producedstill sound, or, more precisely, the oscillation of one or both bodies and inthe surrounding air under certain circumstances, we call itaction. Moreover, in the air there was not only fluctuation, butwas formed and several streams, caused by passage of the tel. Further,moves the particles of the body adjacent to the point of their collision, -moving, reaching sometimes to a marked increase in the density of the body. Morefurther, an increase in the density of the body is accompanied by the separation of the heat. In the otherthe result is a spark, i.e. the light from the ignition broken-off parts,sometimes the inflammation is associated with chemical combination. Soinitial, mechanical, power expended at impact, produces, accordingleast five, and often more different types of modifications. Let's take anotherexample - burning of the candle. Original is a chemical changedepending on the temperature increase. The connection process, once excitedextraneous heat, gives rise to continual formation of carbon dioxide, wateretc., which in itself is a phenomenon more complex thanextraneous heat originally generated it.
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