- published: 18 Nov 2014
- views: 157682
A lever (/ˈliːvər/ or US /ˈlɛvər/) is a machine consisting of a beam or rigid rod pivoted at a fixed hinge, or fulcrum. A lever is a rigid body capable of rotating on a point on itself. It is one of the six simple machines identified by Renaissance scientists. The word entered English about 1300 from Old French, in which the word was levier. This sprang from the stem of the verb lever, meaning "to raise". The verb, in turn, goes back to the Latin levare, itself from the adjective levis, meaning "light" (as in "not heavy"). The word's ultimate origin is the Proto-Indo-European (PIE) stem legwh-, meaning "light", "easy" or "nimble", among other things. The PIE stem also gave rise to the English word "light". A lever amplifies an input force to provide a greater output force, which is said to provide leverage. The ratio of the output force to the input force is the mechanical advantage of the lever.
The earliest remaining writings regarding levers date from the 3rd century BC and were provided by Archimedes. 'Give me a place to stand, and I shall move the Earth with it' is a remark of Archimedes who formally stated the correct mathematical principle of levers (quoted by Pappus of Alexandria). The distance required to do this might be exemplified in astronomical terms as the approximate distance to the Circinus galaxy (roughly 3.6 times the distance to the Andromeda Galaxy) - about 9 million light years.
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Genres: Comedy, Crime,View full lesson: http://ed.ted.com/lessons/the-mighty-mathematics-of-the-lever-andy-peterson-and-zack-patterson Archimedes once said “Give me a place to stand, and I shall move the Earth.” While the idea of a person moving such a huge mass on their own might sound impossible, chances are you’ve seen this idea in action at your local playground. Andy Peterson and Zack Patterson use the seesaw to illustrate the amazing implications and uses of the lever. Lesson by Andy Peterson and Zack Patterson, animation by The Moving Company Animation Studio.
De lever heeft een belangrijke rol bij het constant houden van de bloedsuikerspiegel. Na een maaltijd stijgt het glucose gehalte in het bloed. De alvleesklier produceert insuline. Door de insuline zijn de cellen van het lichaam, waaronder de cellen van de lever in staat glucose op te nemen uit de bloedbaan en hierdoor het bloedsuikerspiegel te verlagen.
After watching this video session, it is expected that you will be able to Define levers. Enumerate the main uses of levers Identify the three classes of levers Give mechanical examples of each class of levers Compare the mechanical advantage in the three classes of levers Give anatomical examples of each class of levers Explain why the second class lever at the ankle joint is the most suitable for its function. Discuss the fact that third class levers are the most common in the body Presented and edited by Dr. Akram Jaffar (PhD). This video and its channel are supported by "Human Anatomy Education" Page on Facebook http://www.facebook.com/AnatomyEducation
This animation provides a brief description of what a lever is, what the types of levers are and where they are used in our daily lives.
Check out us at:http://www.tutorvista.com/content/physics/physics-i/power-energy-machines/levers.php Three Classes of Levers The basic model of the simple lever consists of a stiff or the rigid rod, which is placed on a support, which is fixed. The rigid fixed support is called fulcrum. The concept of the force is the principle of moment of force about the fixed point that means the fulcrum. For the same moment, the large force is applied over a small distance or the small force for the long distance. The formula to find the moments of force is the product of force and the perpendicular distance. We can write the formula as force × distance. Please like our facebook page http://www.facebook.com/tutorvista Follow us at: https://plus.google.com/+tutorvista/
Vi vill varna tittare för starka bilder. Den här filmen är den sista delen i en serie på tre delar. Serien innehåller dissektion av hjärta, lungor, njure och lever från gris. Dissektionen ingår i kurser på Högskolan Dalarna. För mer information besök oss på http://www.du.se Utbildningar inom vård och omsorg på Högskolan Dalarna http://du.se/sv/Utbildning/Vard--Omsorg/
In deze video leg ik uit welke taken door de lever worden vervuld. Bronnen: -Bestand: Surface_projections_of_the_organs_of_the_trunk.png - Wikipedia, the Free Encyclopedia, ingezien 15 december 2013. http://en.wikipedia.org/wiki/File:Surface_projections_of_the_organs_of_the_trunk.png -Bestand: Gray591.png - Wikipedia, the Free Encyclopedia, ingezien 15 december 2013. http://en.wikipedia.org/wiki/File:Gray591.png -Bestand: Hepatic_structure.png - Wikipedia, the Free Encyclopedia, ingezien 15 december 2013. http://upload.wikimedia.org/wikipedia/commons/0/05/Hepatic_structure.png -Bestand: 1GZX_Haemoglobin.png - Wikipedia, the Free Encyclopedia, ingezien 15 december 2013. http://en.wikipedia.org/wiki/File:1GZX_Haemoglobin.png -Bestand: Heme_b.svg - Wikipedia, the Free Encyclopedia, ingezien ...
Turn the mirrors face the wall
Don't you feel a little weak?
And I'd catch you when you fall
But you're falling all the time
Do you need it anymore?
Or do you need a little more?
Living your life like a bull in the trade
He doesn't know how it feels
Under my thumb like a bone under nail
She's in the know, how's it feel?
Live your life under machine guns
Canary down the mine
Maybe I'm on the lever
Spoiling my broth like a radio kid
Programmed computerised minds
Waving my luck under your nose