Relative position of a point with respect to centroid

I have a point e.g, (2,3) and centroid e.g., (8,9). How to find relative position of this point X and Y with respect to centroid? and relative velocity with respect to centroid. Is relative velocity different from the usual/normal velocity?

Answer 1

[David Goodmanson]

Hello Blue The relative position is the coordinates of the point in question minus the 'with respect to' point which in this case is the centroid. So in terms of Matlab vectors,

relposition = [2 3] - [8 9]

It is the same with velocities, velocity of point in question minus velocity of centroid. So relative velocity could well be different than the velocity of the point in question.

[BlueBee77]

thanks for your comment but isn't this how we calculate the absolute position. I thought relative position is calculated as:

Relative position= (value2- value1)/value 1

Correct me if i am wrong.

[David Goodmanson]

In physics anyway, relative position is how I described it above. It's good to verify things and not depend on just one opinion (mine included), so you could take a look at 'displacement (vector) wiki' (the second sentence) or at https://www.youtube.com/watch?v=2Oebgo04feI