So, I'm trying to understand how tension works between a cable. No, not homework. A book example. I have the answers. a = 0.679 m/s2 t = 12s So, I've seen the free-body diagrams. There is tension, sure, but the tension is in perpendicular directions. The book gives examples of tension in a linear fashion with 1N <--- (hand)-----cable---------(hand) ---> 1N So, since each hand is pulling on the ends of the cable with 1N of force, there is a net force of zero. Ok, sure. But as a vector force, it seems like this is constrained to being within the realm of the x-axis. Now, the problem I listed has a cable.. sure.. and the difference is that the vector forces are pulling in different directions. The cable has tension caused by the "pull" of the climber, and it has tension caused by the pull of the rock. Thus, there becomes a netforce of zero. Well, I have a couple of questions about this: 1) Does tension exist between the rock and the climber? Or does it exist for the climber and the rock separately? I think like this is an English issue of expressing how the tension exists with these two objects. Is tension shared between the climber and the rock? Because it's in two different directions... With the linear version, it seems like it is obviously shared. It is, right? Because if I were to draw free-body diagrams, it seems like the climber has his own tension in opposition to gravity. And the rock has tension in the positive x-axis direction... But the rock's tension is caused by the climber... so it makes me think that these tensions do not belong specifically to each individual object and instead is shared. With the way I see it, there are two free-body diagrams. And then again, because the free-body diagrams have their own tension, it makes me think the tension is not shared between the two objects. 2) Why does the linking object (rope, in this example) not accelerate? There would be a change in the climber's position over time, and with that, the rope would definitely move throughout time. And movement would lead to velocity, which can be derived to find acceleration... So, I don't see why there couldn't be an acceleration of the rope.. Maybe there is more to my questions, but I'll see what the responses are for now.