Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

384 moleswoeth’s pocket-book Accumulated Work. w s= Weight of body in lbs. v = Velocity of body in feet per second. h = Height in feet through which the body descends. J x =i Distance in feet to which any obstacle is moved by the body. "F = Force imparted by accumulated work in lbs •V = Accumulated work in foot-lbs, nr i wv2 W i v — h w =----• J? —_____. 64-4’ x Collision of Bodies. W = Weight of one body. V = Velocity of one body before impact. Y == Velocity of one body after impact. K = Coefficient of one body. w = Weight of the other body. v — Velocity of tlw other body before impact. y = Velocity of the other body after impact. ' k — Coefficient of elasticity of the other body. = o fov a non-elestic body, = 1 for a perfectly elastic body. J W hen u body strikes a plane surface it rebounds at an angle equal to that at which it struck the plane; in other words, the angle of incidence a = the angle of reflection b. % ft/ PLANE SURFACE