1. The problem statement, all variables and given/known data I can't speak physics very well. So when you help me be a little patient please. A 2.5 kg block is initially at rest on a horizontal surface. A horizontal force F of magnitude 6.0 N and a vertical force P are then applied to the block. Fig 6 shows a picture of a block at rest and the forces applied in there directions. The coeffictients of friction for the block and surface are static friction=.40 and kinetic friction=.25. Determine the magnitude of the frictional force acting on the block if the magnitude of P is (a) 8.0 N, (b) 10 N, and (c) 12 N. 2. Relevant equations[/b Fk=Uk Fn Fs,max=Us Fn -Fk=ma Fn=mg Fs=ma (Kinematic Equations table) 3. The attempt at a solution Ok I have to find the magnitude of the friction force. Usually when I come across problems finding magnitude I usually use the equation Fn=√Fx^2 + Fy^2 do i have to find something first before i find the magnitude. Like the acceleration or something.