The two reactant forces on the ladder are -Fwall on Ladder and -Fground on Ladder
To know the reactant forces on the ladder, we use Newton's third law of motion.
Newton's third law of motion states that for every action, there is an equal and opposite reaction.
So, for the ladder, as the ladder leans against a wall it exerts a force on both the wall and ground.
Now, since the ladder exerts a force on the wall, according to Newton's third law, the ground also exerts an equal but opposite force on it. If the force of the ladder on the wall is Fladder on wall, then the reaction force of wall on the ladder is Fwall on ladder.
So, Fladder on wall = -Fwall on Ladder
Also, since the ladder exerts a force on the ground, according to Newton's third law, the ground also exerts an equal but opposite force on it. If the force of the ladder on the ground is Fladder on ground, then the reaction force of ground on the ladder is Fground on ladder.
So, Fladder on ground = -Fground on Ladder
So, the two reactant forces on the ladder are -Fwall on Ladder and -Fground on Ladder
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