For some reason I couldn't answer this, and I hope you can help me: a) Two people pull on a rope, one with 200 N , the other 100 N. Why is the tension on the rope the shared magnitude of both forces? b) If two people pull on a rope with equal force (say, 100 N), each person pulling feels their own force (Newton's 3rd law) plus the force the other guy exerts. Why is the tension not 200 N then? c) If you could also explain what really happens in (b) with another combination of forces (non-equal), addressing how newton's third law works in that case, I'd appreciate it very much. (say, 200 N and 100 N). Thank you very much.