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# A Visual Presentation on Simple Machines

Actually by Paige Johnson
by

## Natasha Weasley

on 15 March 2013

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#### Transcript of A Visual Presentation on Simple Machines

A Visual Presentation
on Simple Machines BY Paige Johnson Pulleys Lever Inclined Plane Wheel and Axle Screw Wedges A Diagram... A pulley is:
a simple machine that basically has
a wheel with a grooved rim where a
pulled chain, rope, or wire can run to change the direction of the pull and thus be able to lift a load. A first class lever is: a lever which has a fulcrum between the load/weight and the applied force. (MA cn be 1 or more than 1)

A second class lever is: a lever which has the load/weight between the fulcrum and the applied force (MA is more than 1)

A third class lever is: a lever which has the applied force in between the fulcrum and the load/weight (MA is less than 1) An inclined plane is: a supporting, flat surface that is tilted at an angle so that it can help in moving a load. A wedge is: a combination of two inclined planes and is primarily used to hold objects in place, split objects or hold up objects. A wheel and axle is: a simple machine that has an axle with a wheel attached to it so that when a twisting force that tends to cause rotation is applied, the rope or chain is wound onto the axle A screw is: a simple machine with the ability to change rotational force into linear force and rotational motion into linear motion and basically is an inclined plane wrapped around a metal rod. www.wallpaperpimper.com Pulley Diagram... Input/ Output/ Two Common Uses for a Pulley Wheel and Axle which
the pulley moves on Pulley pulling
the bucket up http://pictures.picpedia.com/2012/09/Elevator_Pulleys.jpg http://i.istockimg.com/file_thumbview_approve/5585047/2/stock-illustration-5585047-wishing-well.jpg Elevator Pulleys
used to pull elevators
up and down Diagram of the Three Types of Levers... http://01.edu-cdn.com/files/static/wiley/9780470408810/THE_THREE_CLASSES_OF_LEVERS_01.GIF *The mechanical advantage for a pulley can be found by dividing the height you lifted the load to by the length of the pull.* Every day Uses for First Class Levers... http://etc.usf.edu/clipart/galleries/776-simple-machines Scale to weigh things Trebuchet to siege cities http://www.turbosquid.com/3d-models/weapon-medieval-catapult-3d-max/404397 Every Day Uses for Second Class Levers... droualb.faculty.mjc.edu Every Day Uses for Third Class Levers http://utahscience.oremjr.alpine.k12.ut.us/sciber99/8th/machines/sciber/machine5.htm *Mechanical advantage calculated by Input Distance/Output Distance.* * The mechanical advantage can be found by dividing the sloping length by the vertical side length.* A Diagram.... http://www.engquest.org.au/students-sm-up.cfm MA = Input Distance/Output Distance
MA = 25/5
MA = 5 Example of Finding Mechanical Advantage Example of Finding Mechanical Advantage www.gweaver.net/techhigh/projects/Rube Goldberg/Rube Goldberg Websites/Period 1/TJ-Matt-Baylee-Annique-Rube/lever1.html http://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&docid=uVMNefJjnm_ZJM&tbnid=HYttD9jil0A-JM:&ved=&url=http%3A%2F%2Fpages.northcantonschools.org%2F~hck%2Fdata%2Fjtp1nc%2Ffiles%2FChapter_4_CPO_Notes.doc&ei=NU5CUf0_w9rLAcG6gfAD&bvm=bv.43287494,d.dmg&psig=AFQjCNGmhjMHRCXQuE5DW3TVY0gO-H-mrg&ust=1363386277742597 It decreases friction and allows you to change the direction of the force on the object. Example of Finding Mechanical Advantage http://www.gweaver.net/techhigh/projects/Rube%20Goldberg/Rube%20Goldberg%20Websites/Period%201/TJ-Matt-Baylee-Annique-Rube/incline_planes.html MA = Sloping Side Length/Vertical Side Length
MA = 28/4
MA = 7 It spreads the work over a longer distance to decrease the amount of force you have to use. Every Day Uses for Inclined Planes http://www.ehow.com/info_8051526_uses-inclined-plane.html Ramps to get on highways To Move the ankle *The mechanical advantage is computed by dividing the length of the wedge by the greatest thickness.* Example of Finding Mechanical Advantage http://www.gweaver.net/techhigh/projects/Rube%20Goldberg/Rube%20Goldberg%20Websites/Period%201/TJ-Matt-Baylee-Annique-Rube/wedges.html MA = Slope Side Length/Width of Wedge
MA = 30/5
MA = 6 It lowers the force needed to move an object. Every Day Uses for Wedges A Diagram... http://learn.uci.edu/oo/getOCWPage.php?course=OC0811004&lesson=006&topic=011&page=18 Output Force Input Force http://msgirardsonlineclassroom.pbworks.com/w/page/31146239/Cierra%27s%20Simple%20Machines To cut into wood to break it in half http://www.grainger.com/Grainger/BATTALION-Door-Stop-1XNN8 To keep doors from moving * The mechanical advantage is found when you divide the radius of the wheel by the radius of the axle.* A Diagram... http://www.fi.edu/time/Journey/Time/Escapements/gearint.html input force acting on wheel axle Output force Example of Finding Mechanical Advantage 5 3 MA= Wheel Radius/ Axle Radius
MA = 5/3