Final answer:
In physics, when a non-self-supporting ladder is placed with the two rails supported, the forces acting on the ladder can be analyzed to determine the magnitudes of the forces at the top and bottom of the ladder.
Step-by-step explanation:
In physics, when a non-self-supporting ladder is placed with the two rails supported, the forces acting on the ladder can be analyzed. There are four forces in this scenario: the normal reaction force from the ground, the static friction force preventing the ladder from slipping, the weight of the ladder, and the normal reaction force from the wall. The magnitudes of the forces on the ladder at the top and bottom can be determined by considering the equilibrium conditions.