hello,

i just can't understand the concept of rotational motion.....

 

plz through more light on moment of interia of rotational motion

Dear

    MOI about an axix  is the decidin factor for the angular acceleration  for a torque  about that axix only.

    It simply represents the mass distribution quantitavly

 

so while forming torque equations first choose an axix about which you need to write the equations you can chose any axix but chosing axix about the COM simplifies the problem toa good extent so in this you also rquire to find the MOI about the COM only

 

   Some time you need to arite equation about an axix paralell to the axix passing through the COM in that case you need to use paralell axix theorem

 

 

Let me know for further clarification