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# Changes in motion - Quick question Watch

1. Ok so i have two velocities in vector form, and the question is wanting its change in speed and in momentum, ive wondered what the actual difference is in this and how you would work out each one? is speed like the numbers squared, then added then square rooted?
2. (Original post by PanthersWill)
Ok so i have two velocities in vector form, and the question is wanting its change in speed and in momentum, ive wondered what the actual difference is in this and how you would work out each one? is speed like the numbers squared, then added then square rooted?
Indeed ... The speed is the magnitude of the vector
3. (Original post by TenOfThem)
Indeed ... The speed is the magnitude of the vector
Ok so what would be the way of working out the momentum? I always get confused
4. (Original post by PanthersWill)
Ok so what would be the way of working out the momentum? I always get confused
Momentum is mv
5. (Original post by PanthersWill)
Ok so i have two velocities in vector form, and the question is wanting its change in speed and in momentum, ive wondered what the actual difference is in this and how you would work out each one? is speed like the numbers squared, then added then square rooted?
As stated, the question is asking you to calculate a scalar quantity (change in speed) and a vector quantity (change in momentum). Is this actually how the question is worded?
6. (Original post by atsruser)
As stated, the question is asking you to calculate a scalar quantity (change in speed) and a vector quantity (change in momentum). Is this actually how the question is worded?
Question is, A ball of mass 100 grams is hit so it changes its velocity from 4i+3jms-1 to 3i+4jms-1. What is its change in speed and what is change in momentum
7. (Original post by PanthersWill)
Question is, A ball of mass 100 grams is hit so it changes its velocity from 4i+3jms-1 to 3i+4jms-1. What is its change in speed and what is change in momentum
And, are you ok with the answer now?
8. (Original post by TenOfThem)
And, are you ok with the answer now?
Im pretty sure i know the speed, just a question of the momentum, still not sure how to work that one out, dont seem to remember going through how to work that one out in a lesson
9. (Original post by PanthersWill)
Im pretty sure i know the speed, just a question of the momentum, still not sure how to work that one out, dont seem to remember going through how to work that one out in a lesson
You need to multiply by 0.1 to give the momentums and then subtract one from the other to find the difference
10. Oh is that it, We have done that then haha, i just was thinking about it too much i guess

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