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## Main Question or Discussion Point

Hey I'm making some kind of simulation... (in game maker) Ball collisions, ball to wall(friction)etc.

So I'm asking: how do i calculate rotational speed if i know r, mass, and distance to where is force being applyed?

I know that moment of inertia for a ball is 2/3*m*r2 and have no idea how to use it...

friction is also a problem.. i dont know how to calculate friction with wall if i know friction koeficient...

(sry for any mistake, im not from england)

So I'm asking: how do i calculate rotational speed if i know r, mass, and distance to where is force being applyed?

I know that moment of inertia for a ball is 2/3*m*r2 and have no idea how to use it...

friction is also a problem.. i dont know how to calculate friction with wall if i know friction koeficient...

(sry for any mistake, im not from england)