# Impulse, momentum, and force during motion around a circle

1. Feb 22, 2012

### iamhe

Hello,
How would you calculate the impulse during the time which a car drives in a circle. You are given the car's mass and constant velocity and the time that the car was turning and how many degrees the car turned.

2. Feb 22, 2012

### azureth

Try the theorem of momentum.

3. Feb 22, 2012

### iamhe

In the problem that I have, since neither the mass nor velocities change during the turn, would the impulse just be 0 for the duration of the turn?

4. Feb 22, 2012

### azureth

The momentum is a vector.Though the magnitude of it in your problem is a constant,it changes in its direction.

5. Feb 23, 2012

### iamhe

I'm still not sure what that means...

6. Feb 23, 2012

### azureth

I=mv2-mv1
Here I,v1,v2 are all vectors.I is the impulse.v1 is the initial velocity.v2 is the final velocity.Surely you can not say v1-v2=0(remember v1 and v2 are vectors ).

7. Feb 23, 2012

### iamhe

Oh right. v1 and v2 will be pointing in orthogonal directions.
So how can I represent these vectors in the given formula?