1. The problem statement, all variables and given/known data A chain of three links, each with a mass 0.2 kg, is being pulled up by a person lifting the top link with 8.88 N of force and the chain accelerates upward. Calculate three forces that are acting on the middle link while the chain is accelerating. 2. Relevant equations ƩF = ma Fg (weight) = mg 3. The attempt at a solution I drew a free body diagram showing tension force pulling up by 8.88 N and the weight, Fg, pulling the chain down. I calculated Fg = mTg (total mass of chain) = (0.6 kg)(9.8m/s^2) = 5.88 N. By the way, is it right for me to assume the mass of the middle link = total mass of the chain (0.2 kg*3 = 0.6 kg)? So, I have found two forces, I believe... and I'm not too sure on what the third force would be. I've learned about the internal forces of each object if they are acting on one another but I'm not sure if that's it, or how to calculate it. Oh, and I found acceleration by a = ƩF/m = 3 N/0.6 kg = 5 m/s^2, if what I have done above is correct.