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# The M2 Revision Thread (24/05/05) watch

1. Anyone doing this exam as well?

Post your problems and questions here and any links related to the topic!

Good luck everyone!
2. yeah i am!
not many problems so far
3. (Original post by hajira)
yeah i am!
not many problems so far
4. can someone explain what you have to do when they say "find a range of possibilities for e" (coefficient of restitution)
5. (Original post by ArVi)
can someone explain what you have to do when they say "find a range of possibilities for e" (coefficient of restitution)
They usually give you some indication whether or not one of the balls changes direction after the collsion. It doesn't matter whether it changes or not, you can still do this.

Say if they say, the direction of P is reversed due to the collision, and 'v' is the velocity of P after the colliion, then you say:

v < 0 (v is less than 0) and solve the equality to get 'e' as the subject.

If they say the direction of P is unchanged then you say

v > 0 (v is greater than 0)

I think you usually use the ball where there is some uncertainty which way it is going to move after the collision...

I hope this helps.. It might be a bit confusing.. (i have that effect on people!)
6. Can anyone help with question 29 in Review Exercise 2...

I'm having trouble finding out the anti-clockwise moment about O keep getting an answer that is different from the back of the book...

Any help appreciated...
7. This exam should be good. Hopefully 90+ UMS.
8. (Original post by Widowmaker)
This exam should be good. Hopefully 90+ UMS.
Exactly. I'm hoping to do well on M2 to cover up for failing in other modules.....

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