. Elementary lessons in the physics of agriculture. Agricultural physics. 17 points where the power and weight are applied; these are represented in Fig. 3. The mechanical advantage of the crow-bar, in moving a heavy object, lies in the fact that it enables the muscles to generate energy at their usual relatively rapid rate, and transform it into so slow a velocity in the load to be moved that a heavy weight is required to balance the smaller, more rapidly acting power. Suppose we have a crow-bar sixty inches long, and the fulcrum is placed at two inches from one end when it is being used as a
. Elementary lessons in the physics of agriculture. Agricultural physics. 17 points where the power and weight are applied; these are represented in Fig. 3. The mechanical advantage of the crow-bar, in moving a heavy object, lies in the fact that it enables the muscles to generate energy at their usual relatively rapid rate, and transform it into so slow a velocity in the load to be moved that a heavy weight is required to balance the smaller, more rapidly acting power. Suppose we have a crow-bar sixty inches long, and the fulcrum is placed at two inches from one end when it is being used as a lever of the first class. In this case, as shown in Fig. 4,. both the power and the weight travel on the circumferences of circles, the power circumference having a radius of fifty- eight inches, and the weight circumference having a radius of two inches. Now the circumferences of these two circles have the same relative lengths as their radii do, and since the lever does not bend, the weight can have a velocity only -^^ or ^^ as great as that of the power, and since the power is ten and its velocity twenty-nine times that of the weight, its momentum must be 10x29=290; and this being true, the weight, in order to just balance the power, must have mass enough so that, with a velocity of one. 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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