The 6 Simple Machines Vision Charter School（6简单机器视觉特许学校）.pdf

The 6 Simple Machines Inclined Plane Screw Wedge Pulley Wheel and Axle Lever Definitions: Energy: Ability to do work Work= Force x Distance Force: A Push or a Pull Inclined Plane Inclined Plane  The Egyptians used simple machines to build the pyramids. One method was to build a very long incline out of dirt that rose upward to the top of the pyramid very gently. The blocks of stone were placed on large logs (another type of simple machine - the wheel and axle) and pushed slowly up the long, gentle inclined plane to the top of the pyramid. Inclined Planes An inclined plane is a flat surface that is higher on one end  Inclined planes make the work of moving things easier Work input and output Work input is the amount of work done on a machine. Input force x input distance Work output is the amount of work done by a machine. Output force x output distance Wout = Win Din 15 m Dout Fout x Dout = Fin x Din 3 m 10N x 3m = 2N x 15m 10 N Fin Inclined Plane - Mechanical Advantage  The mechanical advantage of an inclined plane is equal to the length of the slope divided by the height of the inclined plane.  While the inclined plane produces a mechanical advantage, it does so by increasing the distance through which the force must move. Screw The mechanical advantage of an screw can be calculated by dividing the circumference by the pitch of the screw. Pitch equals 1/ number of turns per inch. Wedges Two inclined planes joined back to back. Wedges are used to split th