No friction between m2 and M.
The static friction between M and the floor is μs and the dynamic is μd.
When F=0, what is the minimal static friction if M doesn't move?
Force caused by friction: μN=F
The Attempt at a Solution
What I thought is that m2 is affected by gravity, normal and tension and that M is affected by m2's normal, gravity, it's own normal and the friction.
I wrote the following equations:
Ncosθ+Mg=N' (N' is M's normal).
What am I missing here?