Opgave_122.pdf - Opgave 122 En klods med massen m bevæger...

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Opgave 122 En klods med massen m bevæger sig mod højre på et bord med ru overflade. Friktionskoefficienterne mellem klodsen og bordet betegnes med k s , µ µ . Klodsen rammer efter at have tilbagelagt strækningen, L , en fjeder med fjederkonstanten, k . Klodsen starter med fart 1 v . a) Opstil en ligning hvoraf fjederens maksimale sammentrykning, d , kan bestemmes. b) Bestem en ulighed s µ skal opfylde hvis klodsen forbliver i hvile efter sammentrykningen. Sammentrykningen, d , antages nu at være en kendt størrelse. a) Når fjederen er maksimalt sammentrykket er farten nul. Under klodsens bevægelse fra udgangspositionen til den står stille, udfører den kinematiske friktion og fjederkraften arbejde på klodsen. Vi benytter arbejdssætningen, hvor situation 1 svarer til udgangspositionen og situation 2 til der hvor fjederen er maksimalt sammetrykket/klodsens fart er nul.
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  • Spring '19

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Christopher Reinemann
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