Part A
Suppose a 10 kg cubic box is at rest on a horizontal surface. There is friction between the box and the surface characterized by a coefficient of static friction equal to 0.50. If one person pushes on the box with a force F1 of 25 N directed due north and a second person pushes on the box with a force F2 = 25 N directed due south, what is the magnitude and direction of the force of static friction acting on the box?
System: Box as point particle subject to external influences from the earth (gravity) the surface (normal force and friction) and the two people (applied forces).
Model: Point Particle Dynamics.