The way in which a lever will operate is dependent on the...
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BIOMECHANICS Levers Cobourg Collegiate Institute 1 2015 What is a lever? A lever is a combination of three components that create a mechanical advantage in the application of force. • Fulcrum (Axis) the point about which the lever rotates • Load (Resistance) the weight applied to the lever system • Force (Effort) the force applied by the user of the lever syste m • Fulcrum (Axis) • Load (Resistance) • Force (Effort) The way in which a lever will operate is dependent on the classification of lever.
Transcript of The way in which a lever will operate is dependent on the...
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BIOMECHANICSLevers
CobourgCollegiateInstitute 1
2015
Whatisalever?Aleverisacombinationofthreecomponentsthatcreateamechanicaladvantageintheapplicationofforce.
Fulcrum(Axis)thepointaboutwhichtheleverrotates
Load(Resistance)theweightappliedtotheleversystem
Force(Effort) theforceappliedbytheuseroftheleversystem
Fulcrum(Axis)
Load(Resistance)
Force(Effort)
Thewayinwhichaleverwilloperateisdependentontheclassificationoflever.
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BIOMECHANICSLevers
CobourgCollegiateInstitute 2
2015
Class1Thefulcrumliesbetweentheforceandtheload
Asthefulcrummovestowardtheloadthemechanicaladvantageincreasesandtheloadbecomeseasiertomovebutitsrangeofmotionanddistalendspeeddecreases.
Asthefulcrummovestowardstheforcetherangeofmotionandthedistalendspeedincreasesbutthemechanicaladvantagedecreases.
Class2Thefulcrumisatoneend,theforceattheotherendandtheloadliesbetweentheeffortandthefulcrum
Astheloadmovestowardthefulcrumthemechanicaladvantagesincreasesanditbecomeseasiertomovebutitsrangeofmotionandspeeddecrease.
Astheloadmovestowardstheforcetherangeofmotionandspeedincreasesbutthemechanicaladvantagedecreases.
Class3Thefulcrumisatoneend,theloadattheotherendandtheforceliesbetweentheloadandthefulcrum
Astheforcemovestowardthefulcrumthemechanicaladvantagedecreasesandtheloadbecomesmoredifficulttomovebutitsrangeofmotionanddistalendspeedincreases.
Astheforcemovestowardstheloadtherangeofmotionandthedistalendspeeddecreasesbutthemechanicaladvantageincreases.
ClassificationofLevers
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BIOMECHANICSLevers
CobourgCollegiateInstitute 3
2015
Examplesofleversinourbodies
Foryourarm,legoranybodyparttomove,theappropriatemusclesandbonesmustworktogetherasaseriesoflevers.Bodypartsactasnaturalleversto... increaseforce/power increasespeed
Shortleverssupplypower.Theseleversareusedtoinitiatemovement.
Longleverssacrificepowerbutincreasedistalendspeeds.
Class3Seatedbicepscurl
Class2Standingheellift
Class1Seateddumbbelltricepsextension
Class3isthemostcommonclassofleverfoundinthehumanbody.
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BIOMECHANICSLevers
CobourgCollegiateInstitute 4
2015
Thekineticlinkprinciplecanbesummarizedasthebody'sabilitytocreatemaximumspeedandpowerbyproperlysequencingbodymovement.Inthecaseofgolf,baseball,andtennis,themainobjectiveistoefficientlytransferenergyfromtheground,throughthebody,andintotheballtoachievemaximumvelocityatthepointofimpact.
TheKineticLinkPrinciplecanbedefinedasthegeneration,conservationandtransferofangularmomentumthroughthesequentialaccelerationanddecelerationofbodysegments,mostmassivetoleastmassive,mostproximaltomostdistal.
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Attachments
BarrySanders.mov
SMART Notebook
Page 1: What is a leverPage 2: Class of leverPage 3: Human leversPage 4: K L PAttachments Page 1
