2020PPp1q9 moments – Find force P acting on stick by shoulder

Using the concepts that POM, we know 1) Ma = Mc

2) net force on the stick is 0N.

Most of us will most likely to take pivot about P as default, and find F, then P using the concept of net force = 0N.

But a body is in equilibrium, you can actually take pivot about any point in the body to do calculation based on Principle of Moments (POM). This method is especially using to find the answer for P straight away. The video below will guide you the normal and the short-cut.

Answer: Option D