# A College Text-Book Of Physics by Arthur L. Kimball

By Arthur L. Kimball

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Simple machines, known also as the mechanical powers, are the rope and pulley, lever, wheel and axle, inclined plane, and screw. All afford interesting cases of forces in equilibriumj but they may also be discussed from the point of view of the conservation of energy, for the work done on a machine must be equal to the work done by it if there is no loss of energy in friction. The ratio of the force exerted by a machine to the force applied is called its mechanical advantage. 80. l00 or not, if there is no friction.

69. -If a mass is hung 80 that it can freely swing 1'9 a pendulum, when it has been raised to the pollition A (Fig. 33) it has been raised through the vertical distance h from B to D, and, therefore, has mora potential energy at A than at B by the work done in raising it from B to A. If allowed to fall freely it will reach the bottom, moving with sufficient velQlJity to carry it up to C on the same level as A. At the bottom the mass has energy of motion or kinetic energy. It has entirely lost the MECHANICS 42 advantaee 01 position which it.

In the first case x =z Y. therefore P = W. In the second case x - ~y, therefore ~W = P. In the third case also % ... ~Y. therefore)4W =z P. :I It should be DOted that. nnot Ilay that Wz - P1I. for BOrne of the work done is spent in raising the movable pulleys. ((w + W). 82. ;' is exerted at the end of the AT longer arm of the lever. A T G) crowbar as used in moving a ' . tP stone, a hammer in drawing a T £W1 I nail, are examples of levers. == Levers are sometimes divided into threeclassesdepending on Flo.