Suppose you have two blocks, A and B. Both are made of the same material, and B is more massive (heavier) than A. There is a massless string connecting blocks A and B. With your hand, you pull block A to the left. Both blocks speed up as you pull them.. You may assume that both blocks have the same coefficient of kinetic friction with the sliding surface. 1. Which should be the greater force: a. FB-on-A b. FA-on-B2. Draw two separate free body diagrams – one for block A and one for block B. Label the forces in the form "FB-on-A", for example, if the force is exerted by object B and felt by object A.