1. The problem statement, all variables and given/known data 1. In a tug of war, two men pull on a rope with 100 lb forces in opposite directions. What is the tension in the rope? 2. The Moon travels around the earth. What are the forces acting on it? Is it the gravity of the earth and sun, gravity of earth and sun + a forward force, or Gravity of earth and sun + outward force and forward force 2. Relevant equations These questions are conceptual, but probably deal with F=ma 3. The attempt at a solution For question 1, I'm not sure if the tensions are additive, meaning that it is 0 because they are in opposite directions or 200. I don't know whether I should add them or would it just be 100. I don't know how to approach it. For question two, I think that there is only the gravity of the earth and the sun because I can't think of any other force that would be acting. Please explain reasoning. Thanks!