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# The Official Edexcel M2 Revision Thread! (24/06/05 AM) watch

1. v < 0...

so if positive direction is forwards

if the particle is going forwards it's motion is reversed after the collision

that bit is ok... but there are question on the m2 papers that are a billion times worse and the mark scheme doesn't explain how these inequalities are formed
2. (Original post by Star_inda_sky)
just did it and did NOT like it. bout 3 parts i dont understand.

question 3b) why do they ignore gravitational forces and potential energy when finding µ?
question 4b) how have they found µ? the answer doesnt make sense
question 7e) where did the forces 'S' and 'R' come from?

if ne1 has any idea what im talking about, would appreciate any help. im having a dumb day today
3)b you can use newton's second law or energy considerations for this question.
4)b FR </= µR in equilibrium, solve for µ
7)e i don't have the mark scheme so i don't know what you mean.
3. (Original post by Revenged)
have you got any tips for these impossible range of value of e questions

so far no one has been very helpful

and my technique of trial and error... basically just look at the numbers for any way of getting an inequality that is in between 0 and 1 works very rarely
i just found this out today. widowmaker beat me to it
4. (Original post by Widowmaker)
if direction of a particle is changed (normally the case), then V < 0 or V > 0 depending on your positive direction.

so if v = ½(1-3e)u

v < 0
=> ½u - 3eu/2 < 0
=> ½u < 3eu/2
=> u < 3eu
=> 3eu > u
=> e > u/3u
=> e > 1/3
is a bit of a long way of doing that though

surely if

v < 0

you don't need to multiply it out, you can see that

1 - 3e < 0
1 < 3e
e > 1/3
5. (Original post by Widowmaker)
3)b you can use newton's second law or energy considerations for this question.
4)b FR </= µR in equilibrium, solve for µ
7)e i don't have the mark scheme so i don't know what you mean.
cheers xx
6. (Original post by Widowmaker)
if direction of a particle is changed (normally the case), then V < 0 or V > 0 depending on your positive direction.
What about if it doesn't change direction?
7. for 7 (e) I do have the mark scheme so I do know what you mean ...R and S are just the common letters given to reaction forces in Mechanics (With ladders, R would usually be on the ground with S on the wall)
8. (Original post by KAISER_MOLE)
for 7 (e) I do have the mark scheme so I do know what you mean ...R and S are just the common letters given to reaction forces in Mechanics (With ladders, R would usually be on the ground with S on the wall)
yeah but i just have never seen them applied there (have never seen the question) hopin that wont come up, and if it doesn, i know now i need normals and equal and opposite forces (grrr!)

got my bio synoptic tomorrow tooo...noo1 does salters nuffield. gonna go cry now)

good luck all for M2 tomorrow (and bio ppl)
thanks for all the help...be back here 11 30 am tomorrow lol
9. (Original post by Revenged)
is a bit of a long way of doing that though

surely if

v < 0

you don't need to multiply it out, you can see that

1 - 3e < 0
1 < 3e
e > 1/3
yeah, I was just showing the whole method.
10. (Original post by Revenged)
What about if it doesn't change direction?
then the speed after the collision is greater than zero if initial direction of speed is also positive.
11. hello ppl...my last exam tomorrow ...just wnna say gud luk to evryone.I just hope an easy ladder question and a not so complicated centre of mass qs come up..evrything else should be fine..anyway best of luck evryone
12. My predictions for m2 exam
Work-energy principle question
coefficient of restitution
centre of mass (possibly with a semi-circular plate/curved rod - haven't seen these come up yet)
projectiles question (some sort of question involving suvat equations)

The rest could be anything.
13. (Original post by Widowmaker)
My predictions for m2 exam
Work-energy principle question
coefficient of restitution
centre of mass (possibly with a semi-circular plate/curved rod - haven't seen these come up yet)
projectiles question (some sort of question involving suvat equations)

The rest could be anything.
i agree
to that i would also add some sort of 'ladder' type question (although i hope not - a bit too easy IMO)
14. I'll be honest here, I just read a bit of my text book to find out what the work-energy principle actually was....learn something new everyday
15. i'm logging out now people. just wanted to wish everyone a pleasant paper. see you all tomorrow
16. M2...lemme dust off the buk...hehe
17. (Original post by Widowmaker)
My predictions for m2 exam

centre of mass (possibly with a semi-circular plate/curved rod - haven't seen these come up yet)

such as?!?!?!?
18. I'm off everyone, good luck for tomorrow
19. guys n' gals everyone homos, hetero all ya! Please since some of us do physics, do u think it is allowed if maybe instead of using the methods of M2, we then use methods in Physics, do u think it's allowed? please, this is urgent!!! Thanks A MILLION
20. (Original post by mikeA1)
guys n' gals everyone homos, hetero all ya! Please since some of us do physics, do u think it is allowed if maybe instead of using the methods of M2, we then use methods in Physics, do u think it's allowed? please, this is urgent!!! Thanks A MILLION
ofcourse its allowed, as long as you get the right answer.

Good Luck Everyone Tommorrow Today

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