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Simple Machines

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by

Alex Burton

on 15 March 2013

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Transcript of Simple Machines

Wheel & Axle Two round objects that turn around a common axis. Pulleys A pulley is a simple machine that consists of a wheel that a rope wraps around. Levers are a simple machine that consists of a bar that pivots at a fixed point called a fulcrum. Levers Wedges A machine that splits things with a narrow edge. Inclined Planes A slanted surface that uses less input force over longer distances. Simple Machines Levers, Pulleys, Wheel & Axles, Wedges, and Planes Simple machines are machines that redirect force.They also adjust the necessary input force at the expense of input distance. Input force and input distance have an inverse relationship. http://www.bicycleparts.us/brake-lever-530.jpg http://content.answcdn.com/main/content/img/oxford/Oxford_Sports/0199210896.third-class-lever.1.jpg 1st Class lever In a first-class lever, the fulcrum is between the input force and the load. 3rd Class 3rd class levers have the the effort between the fulcrum and the load. A first class lever always changes the direction of a force. MA is calculated using length #1/length #2. 2nd Class lever A second-class lever has the load between the fulcrum and the input force MA is always greater than 1.
Distance needed is increased, but input force is decreased. http://content.answcdn.com/main/content/img/oxford/Oxford_Sports/thumbnails/0199210896.second-class-lever.1.jpg The number of sections of rope that support the load is the same as the MA. Key: MA equals mechanical advantage A pulley can increase MA and/or change the direction of a force. http://www.infoplease.com/images/ency196levers003.jpg MA is always less than one.
Distance needed is decreased, but input force is increased. Block and Tackle Movable Pulley Fixed Pulley Cable Car Crane The MA is found by dividing the length by the width. Length Width http://commons.wikimedia.org/wiki/File:Silver_Pencil_Sharpener.jpg Pencil Sharpener http://www.amazon.com/b?ie=UTF8&node=1069196 Door Stop http://2.bp.blogspot.com/-1152gosZ1e4/Tben5cyO82I/AAAAAAAACdU/uyRg1wSkUsg/s1600/nail_clippers.jpg Nail Clippers Winch http://www.harborfreight.com/off-road-winch-with-automatic-load-holding-brake-12000-lb-capacity-68142.html http://commons.wikimedia.org/wiki/File:Crane_Pulley.jpg MA is calculated by dividing the length by the height. Height Length http://www.google.com/imgres?q=stairs&hl=en&safe=strict&biw=1440&bih=719&tbm=isch&tbnid=EGNjKIPdLf_caM:&imgrefurl=http://www.thisoldhouse.com/toh/stairs&docid=Ay0CNeCnPfjdRM&imgurl=http://img2-3.timeinc.net/toh/i/step-by-step/10/12-staircase/stair-brackets-x.jpg&w=450&h=300&ei=liRDUZWnF7HD4APzuICQBw&zoom=1&sa=X&ved=0CGMQrQMwBw&iact=rc&dur=484&page=1&tbnh=137&tbnw=199&start=0&ndsp=39&tx=157&ty=59 Stairs Screws Screws are just inclined planes wrapped around a cylinder. Loading Ramp http://www.professorbeaker.com/plane_fact.html http://ykonline.yksd.com/distanceedcourses/Courses09/PhysicalScience/Lessons/FirstQuarter/Chapter01/Lesson04/07FirstClassLever.gif http://farm4.staticflickr.com/3590/3671681581_ceddc9bb44_z.jpg http://www.education.com/science-fair/article/lifter/ http://blog.calendars.com/2012/12/international-mountain-day/ Mountain MA is found by dividing wheel radius by the axle radius. http://www.123rf.com/photo_10130208_silver-fan-isolated-on-white.html Fan http://www.aliexpress.com/wholesale/wholesale-computer-chair-wheels.html Computer Chair
Wheel http://commons.wikimedia.org/wiki/File:Volvo_steering_wheel.jpg Steering Wheel Input Force Output Force
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