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Today's OCR M3 watch

1. Anyone take this? What did you think? I thought it was a pretty reasonable paper but wasn't impressed by the way they made it easier ("by taking moments about A on AB and moments about C on BC") We got 5 extra minutes because the fire alarm went off near the end but I'd finished by then. Hope everyone found it ok ('specially posh_git ) xxx
2. lol eeeek i integrated it wrong! the v dv dx question. i 4got that f= something v lol i still don't remember now. but obviously dind't need that part to integrate...but i divided by 2 instead of 3 i got -1050ln(something or other) instead of -700ln(something or other) lol im sure i failed! glad the simple pendulum came up : i thnk i got that all right: as with the motion in a vertical circle and half of the last bungee jump question. by the time i went to those questions my mind had become blank: couldn't think at all? so only got 7/14 possible marks for that bit. jointy rods thing i left till end: i managed to get Y as soemthing like 15.75N or seomthing that looked resonable but then left it lol. im so crap!!

but yeah. came home with a splitting headache and have been in bed until 10mins ago. i still feel really ill!!!
3. I think I did okay... It looks like I got question 1 wrong, though. And that one with the two rods... I stored my answers in my calc, so I'll post them here:

1. This question was about a ball bouncing. I got 4.2 for the first bit and 0.27 for the second, which seems wildly different to everyone else in my year...

2. For the last bit, I got 0.054 radians - how far the angle went past A in a set time for an SHM pendulum.

3. This was the one about two balls colliding - I said B travelled at 2.54 m/s at 64.5 degrees to the horizontal.

4. This was the one with two rods. I had an answer of 65.8 N, at about 20 degrees - nearly everyone else got exactly 39 N, though. I think it varied depending on whether the force at B went up or down...

5. I said 29.7 m/s

6. 8.82 N for the tension at A. This was a mass on a string moving in a circle.

7. This was the bungee jumper question. I got the maximum acceleration as 22.9 m/s2 and the max. displacement as 30m.

4. Yeah I thought that was a relitively easy paper and was well happy with it. Your answers look right apart from numbers 1 and 4.
Heres my answers I think there mostly right

1i 4.2 m/s
1ii 1.53N

2i Period = Pie

3. 2.54 m/s at 25.5 degrees to vertical (same as 64.5 to horizontal)

4.39N exactly

5. 29.7 m/s

6i 2.8m/s
6ii -24.5 m/ss
6iii 8.82 N

7 Displacement 30m
7v Max accelaration 22.9
5. I hate seeing other people's answers! Thought I'd done ok but looks like most of my answers were wrong- I got the same as Imrealrealsexy for 1 and 2. For 3 I got very confused and ended up with the same speed at 90' to original direction which felt wrong but it was how my working came out. 4-same 39 exactly. 5 I got over a hundred Don't remember 6 and I remember not knowing what to do for the max acceleration at 7 and ended up putting down g. Meh. Didn't need to do that well anyway! xxx
6. Annoying that the question I got wrong was an 8 marker - hopefully I'll pick up some method marks!

Several people in my year also got the same speed at 90 degrees to the original for Q3, though I think they changed it afterwards.
7. (Original post by Showsni)
Annoying that the question I got wrong was an 8 marker - hopefully I'll pick up some method marks!

Several people in my year also got the same speed at 90 degrees to the original for Q3, though I think they changed it afterwards.
Yeah I'm hoping for method marks! I knew all the methods needed for most of the questions but I decided to say that the speed along the line on centres was unchanged instead of perpendicular to- that must have been where I went wrong! Very confused head going into that exam! x
8. (Original post by undercover-ange)
I thought it was a pretty reasonable paper but wasn't impressed by the way they made it easier ("by taking moments about A on AB and moments about C on BC")
Yeh, I agree, that question is therefore biased towards the less able candidates. I sat there thinking..."well great now everybody who can solve simultaneaous equations is going to get the 8 marks". And universities are worried about not being able to distinguish between candidates! They're telling us how to solve the problem!
9. i remember something like 64.5 degrees to the horizontal for the 2 balls question. as for the one you had to integrate, i got like v=18256 the first time around....then realised that i forgot the cubed sign! lol! cube rooted it and it turned out like 26 ms-1. but as i said i had integrated it wrong hopefully will get some method marks!

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