Opgave_114.pdf

# Opgave_114.pdf - Opgave 114 a Se kraftdiagrammerne til...

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Opgave 114 a) Se kraftdiagrammerne til højre. Læg specielt mærke til normalkræfterne mellem kasserne. b) Betragt de to kasser som et system. Vi opskriver Newtons anden lov for kasserne. Kendte: 0 , , m g a Ukendte: 𝑛𝑛 2 N2( ↑,3 m ): 3 𝑚𝑚𝑎𝑎 0 = ∑ 𝐹𝐹 = 𝑛𝑛 2 3 𝑚𝑚𝑚𝑚 𝑛𝑛 2 = 3 𝑚𝑚 ( 𝑎𝑎 0 + 𝑚𝑚 ) c) Vi betragter den øverste kasse alene. Kendte: 0 , , m g a Ukendte: 𝑛𝑛 1 N2 ( ↑, m ): 𝑚𝑚𝑎𝑎 0 = ∑ 𝐹𝐹 = 𝑛𝑛 1 − 𝑚𝑚𝑚𝑚 𝑛𝑛 1 = 𝑚𝑚 ( 𝑎𝑎 0 + 𝑚𝑚 ) Problemet (b+c) kan også løses ved simultan bestemmelse af normalkræfterne.
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