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# How did you find the M3 exam?

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• View Poll Results: How was the M3 for you?
very hard
3
2.94%
hard
10
9.80%
ok
36
35.29%
easy
32
31.37%
very easy
21
20.59%

1. (Original post by Student403)
Really? I thought June 15 was easier. Specially 6b will throw ppl off
Comparing the two papers :

1) Calculus for Kinematics : S16 easier than the one in S15 involving the trap rule imo

2) COM : unexpected question as they regularly ask for proving the COM of laminas so S16 probably harder

3) Energy in Hookes Law : S15 harder as that involved a spring not a string

4) Horizontal circular motion : practically identical to S15 so both equal

5) COM : again practically identical cone question so both equal

6) Vertical circles : part a) is standard and so is part b) but just worded in a confusing manner. It's the same concept that t must greater than zero at the top, after finding the radius of the new circular motion it was standard. Thought S15 end question was harder as that involved projectiles which I can often make mistakes on.

7) S16 starts of easier but the second part is unexpected as that involves momentum, so overall S16 harder

Overall about the same but this paper was very similar to S15 so if you nailed that before the exam I'd say you were pretty well prepared for this. Just hope that I didn't make any notation mistakes as that could be a grade changer, reckon the boundaries will be quite high for this one.. Sorry for the rant
2. (Original post by Student403)
True but honestly that was a pisstake of a question. Like even if it had never come up before it will always be an accessible question
I chuckled inside when I turned the page and saw it

I was expecting a monstrous solid body with moments all over the shop and it turned out to be the same spindle I'd done twice before
...
That was.. comprehensive
4. (Original post by Student403)
That was.. comprehensive
Fair play if you read all of it
5. (Original post by ombtom)
Ignoring simple mistakes, I might've got every answer apart from the 9 marker. When it's allowed, please would a genius post/send me a worked solution with how many marks for each step?
Was the 9 marker the show question about AB> L/2 ?

If so, basically you had to set up a new circle with radius r, with the string projected from a horizontal position upwards at the speed you found in the previous question. Then, because it told you that it completed a semi circle, you know that the tension at the top would be >0. Then you can just set up the standard tension/energy equation for the particle at the top, set it >0, then rearrange and worked out that radius < L/2. Which meant that AB>L/2 (Because r=L-AB).

I think that's right!? I ended up with what it asked, so it hopefully is.
6. (Original post by Frannoooooooo)
Was the 9 marker the show question about AB> L/2 ?

If so, basically you had to set up a new circle with radius r, with the string projected from a horizontal position upwards at the speed you found in the previous question. Then, because it told you that it completed a semi circle, you know that the tension at the top would be >0. Then you can just set up the standard tension/energy equation for the particle at the top, set it >0, then rearrange and worked out that radius < L/2. Which meant that AB>L/2 (Because r=L-AB).

I think that's right!? I ended up with what it asked, so it hopefully is.
Think I attempted an energy equation, and the wrote centripetal force, but for some reason I didn't find T when the particle was at the top of the circle.
7. (Original post by ombtom)
Think I attempted an energy equation, and the wrote centripetal force, but for some reason I didn't find T when the particle was at the top of the circle.
Well there'll definitely be some marks for that. It was a difficult question to be fair, I left it until the end because I didn't get it initially. I think that concept has only come up a couple of times in the past if I remember correctly??
8. (Original post by Frannoooooooo)
Well there'll definitely be some marks for that. It was a difficult question to be fair, I left it until the end because I didn't get it initially. I think that concept has only come up a couple of times in the past if I remember correctly??
Yeah, unless I scribbled it out and wrote something stupid.
9. How many marks am I likely to lose for saying T>0 rather than T>=0 for question 6b (show that AB>=l/2) given that all my other working was correct? Also am I likely to lose a mark as I put -1/3N for the 1st question and it apparently asked for the magnitude?
10. (Original post by dsefton)
How many marks am I likely to lose for saying T>0 rather than T>=0 for question 6b (show that AB>=l/2) given that all my other working was correct? Also am I likely to lose a mark as I put -1/3N for the 1st question and it apparently asked for the magnitude?
between 1 and 2 overall. you wont't lose more the 1 for each mistake and maybe lose nothing in the tension question but i think you will
11. (Original post by dsefton)
How many marks am I likely to lose for saying T>0 rather than T>=0 for question 6b (show that AB>=l/2) given that all my other working was correct? Also am I likely to lose a mark as I put -1/3N for the 1st question and it apparently asked for the magnitude?
12. (Original post by Louisb19)
Yep

Posted from TSR Mobile
Easy compared to recent papers. Boundaries are going to be sky high and tight this year I reckon, 70 for 90ums at the very least imo
No they will be the same if not lower than last year, the last two questions had difficult parts and places you could easily make a mistake whereas all of 2015 was standard - don't think TSR is representative AT ALL of the over all population who take the exam. Well Done for finding it easy though but not everyone will have full marks like people seem to think on here
14. (Original post by Foutre en L'air)
No they will be the same if not lower than last year, the last two questions had difficult parts and places you could easily make a mistake whereas all of 2015 was standard - don't think TSR is representative AT ALL of the over all population who take the exam. Well Done for finding it easy though but not everyone will have full marks like people seem to think on here
Hope so. There were only three other people doing M3 at my school, and they're all basically geniuses, so my perspective is probably distorted.
15. (Original post by Foutre en L'air)
No they will be the same if not lower than last year, the last two questions had difficult parts and places you could easily make a mistake whereas all of 2015 was standard - don't think TSR is representative AT ALL of the over all population who take the exam. Well Done for finding it easy though but not everyone will have full marks like people seem to think on here
Disagree, think the boundaries will be slightly higher. Many questions were very similar to ones found in recent papers and it is those recent papers that most candidates turn to first for their revision. Didn't say it was easy, just said that it was more straightforward compared to other papers
16. (Original post by physicsmaths)
between 1 and 2 overall. you wont't lose more the 1 for each mistake and maybe lose nothing in the tension question but i think you will
Thanks, I thought I might have lost 2 for 6b as my working would've lead to AB>L/2 but I just changed this to AB>=L/2 right at the end of my working to satisfy the 'show that'

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