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    (Original post by yodawg321)
    Last question= Rubber?
    i said it was polymeric
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    for the young modulus did anyone else get E= stress/(percentage strain/100) ? and omg I ran out of time so I skipped the 1 mark questions near the end to do the graph/ aeroplane question.
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    (Original post by yodawg321)
    Last question= Rubber?
    Yeah, that's the type of material I thought
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    Hopefully the grade boundaries will be low :/ So many easy marks lost *facepalm*
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    Was the GPE lost doing work against the drag force ?
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    (Original post by MikeyP96)
    i said it was polymeric
    Yeah, that, but is rubber an example? Cause I just mentioned it was
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    (Original post by MikeyP96)
    i said it was polymeric
    Polymeric changes shape on load. Don't think engineers will want the aeroplane tires changing shape :s
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    (Original post by MikeyP96)
    i said it was polymeric
    I said that too

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    (Original post by -bethan-)
    Yeah, that, but is rubber an example? Cause I just mentioned it was
    Correct answer was polymeric, you should get marks for saying rubber. Welp, I'm off home now guys, be on later maybe! Hope everyone did as good as they hoped!
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    (Original post by yodawg321)
    Last question= Rubber?
    I put the material is elastic because it returns to its original shape after the load is removed. It is suitable for plane tires??? because the tires won't be permanently deformed after each landing. The material is rubber - I don't know if that's worth 3 marks or not
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    (Original post by yodawg321)
    Polymeric changes shape on load. Don't think engineers will want the aeroplane tires changing shape :s
    The whole point is that the tyres squash a bit and then stretch again on impact, otherwise it would be like having tyres made of concrete...they'd just break
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    (Original post by OllieGCSEs)
    The whole point is that the tyres squash a bit and then stretch again on impact, otherwise it would be like having tyres made of concrete...they'd just break
    Exactly what I thought :yep:
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    (Original post by OllieGCSEs)
    The whole point is that the tyres squash a bit and then stretch again on impact, otherwise it would be like having tyres made of concrete...they'd just break
    My bad I meant Polythene
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    (Original post by yodawg321)
    Polymeric changes shape on load. Don't think engineers will want the aeroplane tires changing shape :s
    rubber is polymeric and it returns to it's original shape after the load is removed
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    (Original post by yodawg321)
    Polymeric changes shape on load. Don't think engineers will want the aeroplane tires changing shape :s
    rubber is polymeric though, and the graph definately showed a polymeric material, i said that it wouldnt plastically deform from the weight of the plane, because if you use a brittle material it will break and ductile tyres would get squashed and not be wheel shaped anymore
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    (Original post by MikeyP96)
    rubber is polymeric though, and the graph definately showed a polymeric material, i said that it wouldnt plastically deform from the weight of the plane, because if you use a brittle material it will break and ductile tyres would get squashed and not be wheel shaped anymore
    Yeah I made a mistake thought the other dude said polythene
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    Dont the tires absorb energy as the areas under the unloading and loading curve are different ?
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    There was a question in the springs question about the mass. I can't remember how it was exactly worded
    What did everyone put down foe it?

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    (Original post by Joeyoh9292)
    Correct answer was polymeric, you should get marks for saying rubber. Welp, I'm off home now guys, be on later maybe! Hope everyone did as good as they hoped!
    The graph showed Rubber. If you put down Polymeric only that could mean rubber or polythene?!?
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    (Original post by ss2012)
    There was a question in the springs question about the mass. I can't remember how it was exactly worded
    What did everyone put down foe it?

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    i put a=f/m so if the mass increases the acceleration decreases
 
 
 
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