Question

If i start the chapter motion in one dimension not units and dimention first then i can face any problem?

Answer 1

There wont be any noticeable problem, in fact I dont think there will be any.

The chapter units and dimensions mainly deal with the units of physical quantities, error analysis, dimensions of units of physical quantities, etc..

Whereas One dimensional motion deals with kinematics which you have already studied in class 9th chapter motion. Like distance, displacement, acceleration, relative velocity, etc..

There wont be any problem at all if you start with one dimesional motion.

Hope this helps :)