1. The problem statement, all variables and given/known data 2. Relevant equations f_spring = k(x_near - x_far) 3. The attempt at a solution a. FBD: The force goes through the nodes, and the sum of the forces must be 0 because the nodes are massless. Therefore, kx_1 = x(t) So x_1(t) = x(t)/k b. FBD: For this system, the parallel springs have a k_eq of k + 2k + 3k = 6k. This is in series with the 5k spring, so the k_eq for both is 1/k_eq = 1/5k + 1/6k = 5/30k + 6/30k =11/30k So k_eq = 30k/11. Therefore, 30k/11(x_3 – x_1) = x(t) So x_3(t) – x_1(t) = 11x(t)/(30k) c. FBD: Since the k_eq = 2k + 3k +k = 6k, 6k(x_2 – x_1) = x(t) So x_2(t) – x_1(t) = x(t)/(6k) Is my way of thinking correct?