A Treatise on Elementary Statics, Τόμος 12

AC represent acting at right acting parallel angle DAC angular points apparent weight attached balance bisects centre of gravity Complete the parallelogram component forces condition of equilibrium cylinder diagonal distance Draw ELEMENTARY STATICS equal and opposite equal particles find the centre find the condition fixed point force represented fulcrum given force Hence inclined plane length line of action lower block machine magnitude and direction mechanical advantage middle point moveable number of forces opposite directions parallel to BC parallelogram ABDC Parallelogram of Forces perpendicular point of application power and weight pressure Q acting radius represented in magnitude rest right angles rope round the wheel sides similar triangles single force steelyard straight lever straight line support a weight suppose suspended system of pulleys tending to twist tension triangle ADB triangle ADC Trigono Trigonometry units of force vertical line