4. A uniform ladder 19.0 ft long is leaning against a frictionless wall at an angle of 44.9° above the horizontal. The weight of the ladder is 32.8 pounds. A 61.4 lb boy climbs 6.68 ft Calculate the coefficient of static friction that acts between the ladder and the ground to keep the the ladder. up ladder stable. (Pro-Tip: do not waste time converting to SI units as they will cancel appropriately; use the force and distance values given.)

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Rotational Equilibrium And Rotational Dynamics

In physics, the state of balance between the forces and the dynamics of motion is called the equilibrium state. The balance between various forces acting on a system in a rotational motion is called rotational equilibrium or rotational dynamics. 

Equilibrium of Forces

The tension created on one body during push or pull is known as force.