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# Edexcel M1 Impulse question watch

1. I don't really get the impulse stuff in M1 (Edexcel)...
Like for this question (June 2005, q's 2) , I did part a), but for part b), I'm not sure about the direction of the impulse and have got quite a few of these kind of questions wrong...
Could someone explain impulse and momentum please?

Two small steel balls A and B have mass 0.6 kg and 0.2 kg respectively. They are movingtowards each other in opposite directions on a smooth horizontal table when they collidedirectly. Immediately before the collision, the speed of A is 8 m s–1 and the speed of Bis 2 m s–1. Immediately after the collision, the direction of motion of A is unchanged and thespeed of B is twice the speed of A. Find
(a) the speed of A immediately after the collision,(5)
(b) the magnitude of the impulse exerted on B in the collision. (3)
2. (Original post by 29Bilal96)
I don't really get the impulse stuff in M1 (Edexcel)...
Like for this question (June 2005, q's 2) , I did part a), but for part b), I'm not sure about the direction of the impulse and have got quite a few of these kind of questions wrong...
Could someone explain impulse and momentum please?

Two small steel balls A and B have mass 0.6 kg and 0.2 kg respectively. They are movingtowards each other in opposite directions on a smooth horizontal table when they collidedirectly. Immediately before the collision, the speed of A is 8 m s–1 and the speed of Bis 2 m s–1. Immediately after the collision, the direction of motion of A is unchanged and thespeed of B is twice the speed of A. Find
(a) the speed of A immediately after the collision,(5)
(b) the magnitude of the impulse exerted on B in the collision. (3)
Hi!

All impulse is is the change in momentum.

So in this question, to find the impulse exerted on B, you use the equation:

Can you try the question now?

Hope I helped.
3. (Original post by Fanta4TheBanter)
Hi!

All impulse is is the change in momentum.

So in this question, to find the impulse exerted on B, you use the equation:

Can you try the question now?

Hope I helped.
I got this question correct , as I took rightwards as the positive direction and then did

For a different question though (January 2005, q's 1c), I did the same thing, but got -8.25 Ns as the impulse, when the answer should just have been 8.25 Ns...do you know why I got the wrong answer?
4. (Original post by 29Bilal96)
I got this question correct , as I took rightwards as the positive direction and then did

For a different question though (January 2005, q's 1c), I did the same thing, but got -8.25 Ns as the impulse, when the answer should just have been 8.25 Ns...do you know why I got the wrong answer?
If the question simply asks for the magnitude of the impulse, just write down the positive of whatever your answer is if you come out with a negative.
5. (Original post by Fanta4TheBanter)
If the question simply asks for the magnitude of the impulse, just write down the positive of whatever your answer is if you come out with a negative.
Okay, thanks
6. (Original post by 29Bilal96)
Okay, thanks
No problem! Glad I could help!

7. Remember seeing this thread, and just saw this on a mark scheme for anybody that see this again...

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