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We're now studying classical mechanics in AP Physics II (forces specifically) and I have a very broad question. When I'm given a multibody system and am asked to find specific forces, such as tension between two objects, I sometimes use the wrong value for mass. How do I know if I am supposed to add two masses or just use the one object's mass depending on what's asked?
For example, if I am to find the tension in a rope between two objects, do I use the mass of the two objects or of the whole system?
For example, if I am to find the tension in a rope between two objects, do I use the mass of the two objects or of the whole system?