# The 6 Simple Machines Energy: Ability to do work Work= Force x Distance

## The 6 Simple Machines Energy: Ability to do work Work= Force x Distance

Wroth, Carmel, Features Writer has reference to this Academic Journal, PHwiki organized this Journal The 6 Simple Machines Lever Pulley Wheel in addition to Axle Wedge Screw Inclined Plane Energy: Ability to do work Work= Force x Distance Force: A Push or a Pull Definitions: Inclined Plane

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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 in addition to axle) in addition to 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 in addition to output Work input is the amount of work done on a machine. Input as long as ce x input distance Work output is the amount of work done by a machine. Output as long as ce x output distance 15 m 3 m Wout = Win Fout x Dout = Fin x Din 10N x 3m = 2N x 15m 10 N Fin Din Dout 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 as long as ce 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 things. Wedge  Mechanical Advantage The mechanical advantage of a wedge can be found by dividing the length of either slope (S) by the thickness (T) of the big end. S As an example, assume that the length of the slope is 10 inches in addition to the thickness is 4 inches. The mechanical advantage is equal to 10/4 or 2 1/2. As with the inclined plane, the mechanical advantage gained by using a wedge requires a corresponding increase in distance. T Fulcrum is between EF (ef as long as t) in addition to RF (load) Ef as long as t moves farther than Resistance. Multiplies EF in addition to changes its direction The mechanical advantage of a lever is the ratio of the length of the lever on the applied as long as ce side of the fulcrum to the length of the lever on the resistance as long as ce side of the fulcrum. First Class Lever

First Class Lever . Common examples of first-class levers include crowbars, scissors, pliers, tin snips in addition to seesaws. RF (load) is between fulcrum in addition to EF Ef as long as t moves farther than Resistance. Multiplies EF, but does not change its direction The mechanical advantage of a lever is the ratio of the distance from the applied as long as ce to the fulcrum to the distance from the resistance as long as ce to the fulcrum. Second Class Lever Second Class Lever Examples of second-class levers include nut crackers, wheel barrows, doors, in addition to bottle openers.

EF is between fulcrum in addition to RF (load) Does not multiply as long as ce Resistance moves farther than Ef as long as t. Multiplies the distance the ef as long as t as long as ce travels The mechanical advantage of a lever is the ratio of the distance from the applied as long as ce to the fulcrum to the distance of the resistance as long as ce to the fulcrum Third Class Lever Third Class Lever Examples of third-class levers include tweezers, arm hammers, in addition to shovels. Pulleys Pulley are wheels in addition to axles with a groove around the outside A pulley needs a rope, chain or belt around the groove to make it do work

Diagrams of Pulleys Fixed pulley: A fixed pulley changes the direction of a as long as ce; however, it does not create a mechanical advantage. Movable Pulley: The mechanical advantage of a moveable pulley is equal to the number of ropes that support the moveable pulley. COMBINED PULLEY The ef as long as t needed to lift the load is less than half the weight of the load. The main disadvantage is it travels a very long distance. WHEEL AND AXEL The axle is stuck rigidly to a large wheel. Fan blades are attached to the wheel. When the axel turns, the fan blades spin.