The figure shows two forces acting on an object with magnitudes F1=51N and F2=17N. What third force will cause the object to be in equilibrium (acceleration equals zero)?
A 4.00 kg block rests between the floor and a 3.00 kg block as shown in the figure. The 3.00 kg block is tied to a wall by a horizontal rope. If the coefficient of static friction is 0.800 between each pair of surfaces in contract. What horizontal force F must be applied to the 4.00 kg block to make it move?