Static Equilibrium, The Ladder Problem; Shows how to use static equilibrium to determine the force of friction between the bottom of the ladder and the ground surface. The sum of the forces in the x-direction, the sum of the forces in the y-direction and the sum of the torque are set equal to zero.

Torque is a rotating force. It is a measure of how much force is acting on an object that causes the object to rotate. The object will rotate about an axis, which is called the pivot point. It is labeled with the letter P or O. The distance from the pivot point to the point where the force acts is called the moment arm or the lever arm. This distance is labeled with the letter r. This distance r is also a vector, and points from the axis of rotation to the point where the force acts. The force is labeled with the letter F.

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