# Analogy for Curl with Torque: Correct?

1. Mar 31, 2012

### Swimmingly!

I'm studying Curl. And I would like to know if Curl can be correctly understood this way.
Imagine a spanner. It's mouth is A and the end is B.
Imagine if the spanner was a vector pointing from A to B.
If a torque acts on it the spanner will rotate.
Can curl be understood as something like a torque that acts on the spanner (vector) when the mouth "walks" in the direction of the vector?

2. Mar 31, 2012

### Char. Limit

Well, torque and curl ARE both described as a cross product. So I'd say so.

3. Apr 3, 2012

### Swimmingly!

But can I say with confidence:

The curl turns the direction of $\vec{v}$, exactly the same way some torque, codirectional with the curl, would change the direction of $\vec{v}$?

Edit: I'm not sure "curl turns the direchation of $\vec{v}$" makes sense because I ven't understood it very well yet.

Last edited: Apr 3, 2012