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### 24 Cards in this Set

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 Screw ~Inclined plane wrapped around a post. ~reduces effort force (Fe) and direction. Work Output/Input/Efficency Wo= Fe times Dr Wi= Fe times De *input is always greater Efficiency= Wo/Wi times 100 *Never greater then 100% Low Friction= high efficiency Inclined Plane ~Changes the amount of effort force (Fe) and direction. ~2 types First Class Lever ~The fulcrum is between the effort force and the resistence force Ex. crowbar, scissors, see-saw Inclined Plane A smaller force is used but a larger distance is used. IMA= length of plane/ height of plane Ex. steps, ramps Wedge ~2 inclined planes back to back ~reduces effort force (Fe) and direction Second Class Lever ~The resistance force is between the fulcrum and the effort force. Ex. door, wheel, barrow, nutcracker Third Class Lever The effort force is between the fulcrum and resistance force. Ex. shovel, broom, bat, fishing pole IMA of a lever ~Can be determined by the effort arm length divided by the resistence arm length ~The MA can be less than one in some cases Mechanical Advantage The number of times a machine multipliesthe effort force. MA=Fr/Fe ( No units) Fr= resis. Fe= effort IMA ~Is the ideal (without friction) formula which varies with the machine ~Always greater than MA Machine A machine is a device that helps you do work by changing the size or direction of the force. A lever is..... ~a rigid bar free to pivot ~the fixed point of the pivot is the called the fulcrum. ~There are three classes of levers depending where the fulcrum is. Lever ~Changes the amount of effort force (Fe) and direction. ~ 3 classes of levers. IMA of a wheel and axle... IMA=radius of wheel/ radius of axle Ex.ferris wheel, water wheels and gears, wheel chair Pulley ~Wheel and axle working together ~reduces effort force (Fe) and direction. Wheel and Axle ~The lever that rotates in a circle ~made of 2 wheels of different sizes (axle is smaller) ~effort force applied to the wheel which moves a greater distance Wheel and Axel ~several levers working together ~reduces effort force (Fe) Screw an inclined plane wrapped around a cylinder IMA= the closer the ridges the greaterthe IMA Ex. jar lid, screw, drill bit Wedge ~2 inclined planes put together ~an effort force is applied to the thicker end and transferred to the thinner end. Pulleys ~chain, belt, or rope wrapped around a wheel ~changes direction OR amount of force IMA if A wedge.. The longer and thinner the wedge the greater the IMA Ex. knife, zipper, wdge Fixed/Movable Pulley Fixed Pulley- pulley attached to a stationary structure MA is one because it only changes direction Movable Pulley- multiplies force IMA of a pulley... IMA= # of supportive ropes Ex. flag pole