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Levers, Pulleys, and Gears

Prezi created and developed by Nolan and Dakota.

Nolan Sautter

on 7 April 2011

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Transcript of Levers, Pulleys, and Gears

Why hello there!!! Welcome to the magical world of: Levers Pulleys Gears These 3 very basic machines are actually simple how they work, Allow us to show you! Levers consist of a beam that is balanced on a single fulcrum point. The lever sits flat, equal at both sides The Formula: Fe•Le=Fr•Lr Helps us to calculate missing variables involved in lever problems such as this one. ? 5 m 500 Lbs 150 Lbs Nolan vs a Donkey Kong Machine Using our formula, we can calculate the other length of the lever! 150•?=5•500 150•?=2500 ?=2500/150 ?=16.74! Pulleys allow us to lift heavey objects while only pulling for a fraction of that weight, for example... With these 4 ropes on the pully it makes the weight of the basket feel 4 times less heavy as you are pulling on it. 40 Pounds 4 ropes 40 Pounds - 10 Pounds The only downside to this is that you have to pull the 10 pound basket 4 times farther than you would originally pull the 40 pound basket Gears are awesome! The teeth rotate eachother alternating between clockwise, and counter clockwise. Gears have "teeth" around the circumfrence of istself, allowing it to work with other gears Gears Have an equation which allows us to find the speed ratio of any gear in a string of gears #Teeth in First Gear/#Teeth in Last Gear 10 30 5 So 10/5 = 2 The Speed ratio is 2 If you wanted to find mechanical advantage, you would simply reverse the fraction MA = 1/2 Thanks for Watching - Nolan, Dakota
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