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# How did you find the M3 exam? watch

• 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%

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That was.. comprehensive
2. (Original post by Student403)
That was.. comprehensive
Fair play if you read all of it
3. (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.
4. (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.
5. (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??
6. (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.
7. 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?
8. (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
9. (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?
10. (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
12. (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.
13. (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
14. (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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