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# M1 momentum and impulse Watch

1. https://3b0a7b1bc87f5381e60f8f717510...%20Edexcel.pdf

question 1 help now sure what to do
2. (Original post by poundsoffat)
https://3b0a7b1bc87f5381e60f8f717510...%20Edexcel.pdf

question 1 help now sure what to do
I = mv - mu
Where m is the mass, I is the impulse and v and u are the final and initial speed respectively.

For part b) you want to use Conservation of Momentum law.
i.e. Initial momentum = final momentum

Is that okay?
3. (Original post by JLegion)
I = mv - mu
Where m is the mass, I is the impulse and v and u are final and initial speeds respectively.

For part b) you want to use Conservation of Momentum law.
i.e. Initial momentum = final momentum

Is that okay?
so i've done 14=2xV - 2x5 right?
4. (Original post by poundsoffat)
so i've done 14=2xV - 2x5 right?
Yup
5. (Original post by JLegion)
Yup
ok so i get 28=2V
v=14
6. (Original post by poundsoffat)
so i've done 14=2xV - 2x5 right?
(2*-5) it's moving in the opposite direction.
7. (Original post by Middriver)
(2*-5) it's moving in the opposite direction.
how do you know? does it say in the question?
8. (Original post by poundsoffat)
how do you know? does it say in the question?
It's moving in the opposite direction to the direction it received an impulse.
Do you have a drawing for this question?
9. (Original post by Middriver)
(2*-5) it's moving in the opposite direction.
Yes, you're correct. My mistake!
10. (Original post by Middriver)
It's moving in the opposite direction to the direction it received an impulse.
Do you have a drawing for this question?
yes and after i just put 2 arrows going right
11. (Original post by Middriver)
It's moving in the opposite direction to the direction it received an impulse.
Do you have a drawing for this question?

that's my diagram
12. (Original post by poundsoffat)

that's my diagram
13. (Original post by Middriver)
but why is V negative??? how do you know A moves left instead of right?
14. (Original post by poundsoffat)
but why is V negative??? how do you know A moves left instead of right?
you need to state a direction from where the impulse was received, then the directions will be relative to that.
15. (Original post by Middriver)
you need to state a direction from where the impulse was received, then the directions will be relative to that.
but impulse was received by B??? and given by A?
16. (Original post by poundsoffat)
but impulse was received by B??? and given by A?
Yeah but A must also receive an impulse from B.. So it would be the same in the opposite direction.
17. (Original post by Middriver)
Yeah but A must also receive an impulse from B.. So it would be the same in the opposite direction.
18. (Original post by poundsoffat)
https://www.furthermathstutor.co.uk/...d-impulse.html
19. (Original post by Middriver)
https://www.furthermathstutor.co.uk/...d-impulse.html
ok
In an M1 exam on collisions like the one above, you will almost always be asked to find the impulse that one object exerts on the other object. Calculate the change in momentum on the subject object.

so which one's the subject object??????
20. Zacken sorry to ask but could you sort me out? xD

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