What is the mechanical advantage of a doorknob that requires an input force of 50N to produce an output force of 150N?

To determine the mechanical advantage of a doorknob, you can use the formula for mechanical advantage, which is the ratio of the output force to the input force. In this case, the output force is 150N, and the input force is 50N.

Calculating the mechanical advantage:

Mechanical Advantage = Output Force / Input Force

Mechanical Advantage = 150N / 50N

Mechanical Advantage = 3

This indicates that the doorknob multiplies the force applied by the user. Specifically, for every unit of force the user applies to turn the doorknob, the knob is capable of producing three times that amount of force at the door. This property allows a person to open the door with less effort than would otherwise be required without the doorknob.