Calculating Friction Force on a Rotating Disk

[5Mystery]

Homework Statement

The thing that is lying on the disk(Disko), is rotating together with disko. After the rotary frequency of disko grew twice (N X 2), friction(rubbing) Force grew F=6 ( F + 6). You have to understand friction Force module at the original frequency.

Homework Equations

I don't know. Probably, 2N = F + 6 : m X g

The Attempt at a Solution

2N = F6 : mg = F6 : 9,8
F = 9,8 : 6

but I don't think it is correct please help me. Sorry if there are some mistakes but I really need it please do not delete this post.
Thank you very much. :)

 

[tiny-tim]

Welcome to PF!

Hi 5Mystery! Welcome to PF!

The only horizontal force is the friction (and the only motion is horizontal).

So you can find the friction, F, by using F = ma.

So what is the acceleration (a), at an angular frequency ω?