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A Visual Presentation on Simple Machines
Transcript of A Visual Presentation on Simple Machines
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
MA = 1.666 (sorry... I made it myself...) Wheels and axles reduce the amount of work by reducing the friction between two objects. Every Day Uses for Wheels and Axels http://scienceforkids.kidipede.com/physics/machines/wheel.htm Wheel and Axle powers sharpener to sharpen pencils http://icwphotography.photoshelter.com/image/I0000fAPx7B5lQF8 *The mechanical advantage is calculated by dividing the circumference of the screw by the pitch ( pitch = 1/ number of threads per inch).* output force on the object the screw is going into Input force on top of screw Example of Calculating the Mechanical Advantage Wheels for wagons to help them move http://www.engquest.org.au/students-sm-up.cfm http://hyperphysics.phy-astr.gsu.edu/hbase/mechanics/incline.html IMA = 2 L pi/P x x If L is 10 and P is 2, the mechanical advantage of this screw would be 31.4. Screws can be incrementally driven, allowing the energy required to drive the screw to be spread out over time rather than all at once. This can make the work appear and seem easier. Also, screw heads are wider than their shanks (the cylindrical length of the bolt that extends from the underside of the head to the point) so that smaller forces and a bit less work can be used to provide the rotation required to drive the screw into an object. Every Day Examples of Screws used to close and open lids to keep them airtight http://www.goalfinder.com/product.asp?productid=60 http://www.ehow.com/info_8413875_everyday-machines-use-principle-screw.html to hold things together slide to slide down http://upload.wikimedia.org/wikipedia/commons/thumb/0/08/Canadian_National_Exhibition_Big_Slide.JPG/300px-Canadian_National_Exhibition_Big_Slide.JPG Well, that's it. It appears now to be the conclusion of this prezi and I hope you have learned a great deal more about simple machines. I also hope that your future endeavors working with prezi will be just as successful as this one.
( P.S. You gotta love science...;))