Draw separate free-body diagrams of the forces on objects A, B, and C. Is there a difference between the force on mass B and at point P? Assign symbols to all of the forces, and define what they represent next to your diagram. It is also useful to put the force vectors on a separate coordinate system for each object (force diagram). Remember that on a force diagram, the origin (tail) of all vectors is at the origin of the coordinate system.

Draw separate free-body diagrams of the forces on objects A, B, and C. Is there a difference between the force on mass B and at point P? Assign symbols to all of the forces, and define what they represent next to your diagram. It is also useful to put the force vectors on a separate coordinate system for each object (force diagram). Remember that on a force diagram, the origin (tail) of all vectors is at the origin of the coordinate system.

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