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Transcript of Simple Machines
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