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# OCR Advancing Physics G492 ~5 June 2013~ Watch

1. (Original post by King Hotpie)
We did it, but I don't think it helped much. As long as you make sure you know some potential errors, and you actually know how to calculate gravity from the results, I can't really think of much else to do with that article. It's the speed of light one I'm struggling to prepare for.
How would one calculate gravity from a set of results like that?
2. How is everyone feeling for tomorrow? Personally I find some questions really straight forward like ones on waves or quantum, but I get so stuck on mechanics. It doesn't help that I don't take maths either. Hopefully I'm just overthinking things.

3. Can anyone explain Q10b on the May 2012 paper please? Really don't understand it despite looking at the mark scheme.
4. What topics do any of you guys find the most difficult when it comes to doing exam questions on them?

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5. (Original post by Matterhorn)
What topics do any of you guys find the most difficult when it comes to doing exam questions on them?

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Mechanics, mechanics and more mechanics. I never know which suvat equation to do. And questions that say 'prove this formula' or 'show that this formula is correct' when the formula looks like a cat walked across the calculator.
6. (Original post by m00c0w)
Can anyone explain Q10b on the May 2012 paper please? Really don't understand it despite looking at the mark scheme.
Sure thing. Imagine x and y as different components first of all.
So therefore for the x direction: u=12m/s. We can say that v therefore is the component of this speed when the direction is changed by 40 degrees. By the cosine rule therefore: v=12cos40. We then take the difference of those speeds and divide it with the time (1.6) to gain the mean acceleration.

Same thing with y, but we use the sine rule (as it is not an enC(os)losed angle) => 12sin40. Take u=0, and v=12sin40, and then take the difference (-12sin40) and divide that with 1.6 to get the mean acceleration.

I hope that helps.

music to get you pumped and in the zone
8. Does anyone know if we are able to retake this exam? Presumably in June if we are allowed to since January exams are being scrapped
9. Hey guys, I found the digital copy for the prerelease questions at my college, I think they're really helpful! I don't have the mark scheme, but I have most of the answers so feel free to ask

Prerelease questions, themes, etc:

(Pretty) Comprehensive revision notes:

10. (Original post by liomeeringca)
Does anyone know if we are able to retake this exam? Presumably in June if we are allowed to since January exams are being scrapped
we are
11. Could someone help me?
How do calculate uncertainty?
How do you calculate %uncertainty?
How do you calculate resolution?

Many Thanks and Good luck to everyone tomorow, make sure to READ questions properly.... (otherwise you will have to resit like me :P )
12. (Original post by ArchieL)
Hey guys, I found the digital copy for the prerelease questions at my college, I think they're really helpful! I don't have the mark scheme, but I have most of the answers so feel free to ask

Prerelease questions, themes, etc:

(Pretty) Comprehensive revision notes:

Thanks for sharing
13. (Original post by Matterhorn)
What topics do any of you guys find the most difficult when it comes to doing exam questions on them?

Posted from TSR Mobile
Deffinatley Pre release stuff, but in general the questions are tricky to understand, I think thats the hard part, realising what the question wants etc.

I find some of the graph Qs hard where you have to match the best suitable shape of a graph to different variables, but generally just the manor Qs are presented is tricky!
14. Does anyone know how to calculate the uncertainty of a gradient?
15. (Original post by Mathletic)
Could someone help me?
How do calculate uncertainty?
How do you calculate %uncertainty?
How do you calculate resolution?

Many Thanks and Good luck to everyone tomorow, make sure to READ questions properly.... (otherwise you will have to resit like me :P )
There are some great YT vids on the subject, but..
Resolution = Smallest observable change: In the case of a digital display, the amount of d.p, in a graph it's how many units 1 box represents.
16. (Original post by ArchieL)
Hey guys, I found the digital copy for the prerelease questions at my college, I think they're really helpful! I don't have the mark scheme, but I have most of the answers so feel free to ask

Prerelease questions, themes, etc:

(Pretty) Comprehensive revision notes:

HaHa, CSFC I see. Geoff Flloyd, what a legend!

Who did these section C notes, our class never saw them.
17. (Original post by AndItsOllie)
HaHa, CSFC I see. Geoff Flloyd, what a legend!

Who did these section C notes, our class never saw them.
Haha, you know it! Geoff's retiring this year

Also the section C notes were Tim's work this year, he rustled them out as soon as the prerelease came out! The physics dept. at csfc are so hyped on caffeine it's unreal.
18. (Original post by liomeeringca)
Does anyone know if we are able to retake this exam? Presumably in June if we are allowed to since January exams are being scrapped
Its probably a bad idea to even start thinking about resits so close to the actual exam.
19. This might seem straightforward but I'm a bit confused:

A car has an acceleration of 0.86g. Calculate the time it takes to reach a velocity of 27m.s-1.
g=9.81

v=u+at
so t= (v-u)/a

is g=acceleration in this case and the acceleration of the car they give we take it as u and v=27 ?

20. Okay so I'm doing part (b)... and get a funny looking answer, so I check the mark scheme...

Where do you get 169ms-1 and 900ms-1??? I thought it was 13ms-1 and 30ms-1. Could someone please explain?

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