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AQA Physics A- AS - Good Luck / How did u do watch

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    (Original post by sahmed786)
    the one wher you had to find extension or ther mass?

    i got 6x10-4 for one of dem cant rmbr
    yer i got about 5. somthing x 10-4 for that, was the force used 80N for both ? I just used e = FA / lE and put in the values using F=80 both times
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    overall wasnt too bad, got a bit confused by the question about the colliding trains. it looked sooooo easy, and yet when i was working it out i kept getting dodgy looking numbers
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    (Original post by Noxid)
    My whole school agreed that Module 3 was just too hard. What did you lot think. Im convinced that it was so hard that the grade boundarys might have to be dropped
    Is that mechanics? That was really hard. Makes me more annoyed that I got a D in January which was REALLY easy, I even knew it when I did it, but I hadn't revised.

    Now when I did they give me a crap paper.
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    (Original post by thefish_uk)
    lovely, yes, that's what I did.

    One question confused me a bit where momentum was conserved but kinetic energy wasn't, I didn't think that was possible! Luckily I put inelastic collision, saying it was because of the kinetic energy being conserved, and it seems that's right because I happened to bump into my physics teacher afterwards.
    You mean it was inelastic because the kinetic energy WAS NOT conserved,...yeah?

    Momentum is always conserved where no exernal force acts.
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    (Original post by AtSnIaB-42)
    You mean it was inelastic because the kinetic energy WAS NOT conserved,...yeah?

    Momentum is always conserved where no exernal force acts.
    That question that asked if it was elastic, 3 marks?

    I only said it wasn't elastic because some kinetic energy was lost as heat. Don't see what else you could do for the 3 marks....
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    (Original post by rayman198)
    AND FOR MODULE 3 , QUESTION 1, WAS IT A LINE BELOW FOR A AND A LINE ABOVE FOR B, AND FOR PART 1, THE KINETIC ENERGY DID YOU USE 2/3KT, AND THEN FOR THE NEXT PART TIMES THIS BY Na? PART 2 OF THAT QUESTION REALLY CONFUSED ME, I ENDED UP WITH AN ANSWER AROUND 600 OR 6000 JOULES I CNT REMEMBER NOW!!!
    Module 2 I think lol.....
    Hmm. Line below (A) then above (B).
    Yeah used the Boltman equation for the average kinetic energy then multiplied it by the total number of molecules - this was 11 moles x Na (11 moles to 2sf, as the question was in 2sf).
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    (Original post by tis_me_lord)
    That question that asked if it was elastic, 3 marks?

    I only said it wasn't elastic because some kinetic energy was lost as heat. Don't see what else you could do for the 3 marks....
    I wrote something along the lines of -
    Inelastic
    Some energy dissipated as heat/sound
    Total final kinetic energy less than total initial kinetic energy
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    (Original post by corkskrew)
    Module 2 I think lol.....
    Hmm. Line below (A) then above (B).
    Yeah used the Boltman equation for the average kinetic energy then multiplied it by the total number of molecules - this was 11 moles x Na (11 moles to 2sf, as the question was in 2sf).
    Damn! I did 3/2 KT.
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    (Original post by corkskrew)
    I wrote something along the lines of -
    Inelastic
    Some energy dissipated as heat/sound
    Total final kinetic energy less than total initial kinetic energy
    Oh, I didn't do the final bit. I'm hoping I get a mark just for the "no" part, in mark schemes in the past they give marks for that kind of thing sometimes. *prays* :p:
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    Im hoping they will change the grade boundarys
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    (Original post by Noxid)
    Im hoping they will change the grade boundarys
    Always retakes. I have a 75% of my exams I retake ratio so far. :p:
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    did anyone do Specification B? :confused: Or am i the only one......?
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    i thought the momentum question was tedious and relatively easy compared to some of the other questions? just was boring crunching loads of numbers

    what did anyone get for the internal resistance on module 3?

    how many people who took unit two also did mechanics maths?
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    damn, forgot to mention where the kinetic energy went in that train question...
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    (Original post by lifter_gav)
    i thought the momentum question was tedious and relatively easy compared to some of the other questions? just was boring crunching loads of numbers

    what did anyone get for the internal resistance on module 3?

    how many people who took unit two also did mechanics maths?
    I did all 3 of them.

    I'm worried I did kinetic energy wrong. Do you divide mass by 2, then times by v^2.

    Or do you do mass times v^2 divided by 0.5?

    Those ways got me different answers..... :confused:

    Internal resistence I don't remember, I think I used emf = I (R + r)
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    (Original post by lifter_gav)
    i
    what did anyone get for the internal resistance on module 3?

    i think i got r= 0.39
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    I did spec B. I resat materials and took understanding processes for a first time, the understanding processes i found rather quite easy, though, saying that...I completely messed up my resit >_<
 
 
 
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