A large block with mass M is on a frictionless surface and is being pushed with a force F. There is a small block with mass m that is prevented from sliding down the side of the larger mass due to the overall motion. In terms of the variables M, m, F and g, what must be the coefficient of static friction between M and m? To be clear: between M and the ground, there is no friction, but between M and m, there is friction. M

A large block with mass M is on a frictionless surface and is being pushed with a force F. There is a small block with mass m that is prevented from sliding down the side of the larger mass due to the overall motion. In terms of the variables M, m, F and g, what must be the coefficient of static friction between M and m? To be clear: between M and the ground, there is no friction, but between M and m, there is friction. M