. Elementary lessons in the physics of agriculture. Agricultural physics. 18 the amount of motion shall exactly equal that of the powei', and hence we have 1x290=290, as the load which ten will balance on a lever a'^ting as repre- sented. When the crow-bar is used as represented in Fig. 5, it be- comes a lever of the second class, Avith the power-arm sixty inches long, while the weight-arm is still two inches. In this case a power of thirty pounds will balance a load of nine hun- dred 14^. A. ^Z When the power is applied to the lever between the weight and the fulcrum, as repres
. Elementary lessons in the physics of agriculture. Agricultural physics. 18 the amount of motion shall exactly equal that of the powei', and hence we have 1x290=290, as the load which ten will balance on a lever a'^ting as repre- sented. When the crow-bar is used as represented in Fig. 5, it be- comes a lever of the second class, Avith the power-arm sixty inches long, while the weight-arm is still two inches. In this case a power of thirty pounds will balance a load of nine hun- dred 14^. A. ^Z When the power is applied to the lever between the weight and the fulcrum, as represented in Fig. G, the case becomes a lever of the third class, and a power of nine hundred becomes necessary to move a load of thirty. 'wkso ^0 "/f. 6 The relation of power to weight in the case of any lever is expressed by the equation below, where P. equals power, W. equals weight, P. A. equals power-arm and W, A. equals weight-arm: P. X P. A. = W. X W. A. When any three terms in this equation are known the foui'th may readily be Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original King, F. H. (Franklin Hiram), 1848-1911. [Madison, Wis. ] The author
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