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Official OCR A G481 mechanics 20th May 2013

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Reply 420

MikeyP96

Original post by yodawg321

Last question= Rubber?

i said it was polymeric

Reply 421

madrevision

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.

Reply 422

-bethan-

Original post by yodawg321

Last question= Rubber?

Yeah, that's the type of material I thought :tongue:

Reply 423

brawlerpit

Hopefully the grade boundaries will be low :/ So many easy marks lost *facepalm*

Reply 424

smith195

Was the GPE lost doing work against the drag force ?

Reply 425

-bethan-

Original post by MikeyP96

i said it was polymeric

Yeah, that, but is rubber an example? Cause I just mentioned it was :tongue:

Reply 426

yodawg321

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

Reply 427

ss2012

Original post by MikeyP96

i said it was polymeric

I said that too

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Reply 428

Joeyoh9292

Original post by -bethan-

Yeah, that, but is rubber an example? Cause I just mentioned it was :tongue:

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!

Reply 429

madrevision

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

Reply 430

OllieGCSEs

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

Reply 431

-bethan-

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:

Reply 432

yodawg321

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

Reply 433

madrevision

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 :smile:

Reply 434

MikeyP96

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

Reply 435

yodawg321

Original post by MikeyP96

Yeah I made a mistake thought the other dude said polythene

Reply 436

smith195

Dont the tires absorb energy as the areas under the unloading and loading curve are different ?

Reply 437

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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Reply 438

yodawg321

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?!?

Reply 439

MikeyP96

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