What does M2 need to be in order to move?
The interesting thing with this question is if it does move, will it move up or down?
The Attempt at a Solution
I thought about this and if it's going to go up, that's one mass. If it goes down, that's another mass so will there be two masses?
I also though, if it gave the static friction for both, maybe I thought of finding force of static friction for M1:
After that, I think there will be a force of tension and a parallel force of gravity on M1 and if you add all these up with Ff, it must add up to 0...or not since it is a connected to a pulley that is being pulled (or not), it won't add up to 0?