To make the drum revolve once, the pinion gear must rotate six times by the handle, and the handle must turn through a distance S 1 of 6 x 2 p R, or 94.2 feet. Since force is measured in pounds and distance is measured in feet, we measure work in foot-pounds. Machines help you to do work by making it possible to move a large resistance through a small distance by the application of a small force through a large distance. Since friction is present in all machines, more work must be done on the machine than the machine actually does on the load. You can find the efficiency of any machine by dividing the output by the input.
Friction is the resistance that one surface offers to movement over a second surface.
Friction between two surfaces depends upon the nature of the materials and the size of the forces pushing them together. Integrated Publishing's Official Web Page Click here for a current index of everything on this web site. All Rights Reserved.