Elementary lessons in the physics Elementary lessons in the physics of agriculture elementarylesson01king Year: 1894 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 pounds. 14^. A. ^Z When the power is applied to the lever
Elementary lessons in the physics Elementary lessons in the physics of agriculture elementarylesson01king Year: 1894 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 pounds. 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 found.
Size: 2559px × 782px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
