Four identical blocks each of mass m are arranged as shown o…
Four identical blocks each of mass m are arranged as shown on a frictionless surface. Block 1 is pushed with a force F. The coefficient of friction between the blocks is large enough that the blocks do not slide with respect to one another (so there is a friction between the blocks but no friction from the horizontal surface). We can neglect drag from the air. Your friend draws the free body diagram on block 3. You are asked to evaluate their work and you start by making sure they have the right number of forces. You tell your friend