I am trying to draw an FBD for a beam leaning against a frictionless wall attached to a pin at the bottom end. The forces present would be the weight, normal force of the pin attached to the floor and the normal force of the wall. When determining forces that are present, can I remove the object that is exerting the force on my primary object and then anaylze the logical motion that my primary object would follow? For the case above, if I remove the frictionless wall, the beam would fall down and to the right? Wouldn't that mean there is a force that acts upwards and left? Same with the pin. If I removed the pin and floor, the bottom end of the beam would fall to the right and downwards, which would make me think that the force from the pin acts upwards and to the left. My reasoning is wrong. So how would I analyze the forces at the pin and the wall?