What does a pulley force diagram illustrate and how does it help in analyzing the forces acting on a system involving pulleys?

A pulley force diagram illustrates the forces acting on a system involving pulleys. It helps in analyzing the forces by showing the direction and magnitude of the forces exerted on the pulleys and the objects they are connected to. This diagram allows for a clearer understanding of how the forces interact within the system, aiding in the calculation of mechanical advantage and tension in the system.