2. Forces and Friction 2.1 Two blocks of masses m1 = 2.7 kg and m2 = 3.3 kg are connected by a string as shown in the figure above. The horizontal surface is frictionless. A 15 N force directed at 18 degrees above the horizontal acts on m2. Determine the acceleration of the blocks and the tension in the string. 18 Fo m2 m 2.2 Now assume that there is static friction between block m2 and the horizontal surface and that both blocks are at rest. What is the minimum value of the coefficient of static friction if we want to make sure that the blocks do not start to move?