Difference between vector and scalar www.youtube.com/watch?v=KlNVFDDROtk ================================================== Create one vector ================================================== Rotate coordinate system by criterion of centor point ================================================== Vector has smaller angle And let's say point of vector is $(4,3)$ ================================================== You can see vector had been changed from (3,4) to (4,3) And this is characteristic of vector Vector is variable amount when you rotate coordinate system, in other words, when you perform rotating transformation ================================================== Suppose one stick rather than arrow ================================================== You also rotate coordinate system ================================================== Length of stick had not been changed This is characteristic of scalar