Hi all, greetings from aus! having mad trouble with this question:
so i've figured out that the friction limit for block B is 11.35N when it is stationary. Putting my co-ords parrallel to the 15 degree incline means the force due to gravity in the x direction is 5.0728N.. so effectively ill need to make up the 6.2772N so the block B will slide down block A.
Now i've toyed with the idea of makign F Large enough to lift the whole body to an angle where the force due to gravity will overcome friction. However there are no dimensions on the block so i can't make an equation for work needed. SO block A will remain horizontal and slide across. I just don't understand how force F will be able to make block B fall down if it doesn't angle up? It;s probably got something to do with Fy but i just can't see it. Any help would be greatly appreciated. Have been racking my brain for like 5 hrs obver this.