- #1

- 22

- 1

I have read about tensors and generally understand the concept. One core thing about Vector/Tensor as I understand it is that its magnitude and direction should not change with change in coordinate system. I get that when I write vector and also when I use matrix transformation.

However here is my confusion. I see a train moving at say 60km/hr when I am at rest as frame of reference say to North. However from another frame moving north at 40km/hr, the train moves at 20 km/hr north. So here in new frame, the direction did not change but magnitude of vector as seen from new frame is now 20 instead of 60. So it appears that vector does change with respect to frame so is Velocity a tensor?

Can someone explain in easy to understand way?

Thanks