Kevin Zhou — Mechanics II Problem 4 · Kevin Zhou #M2.4
Physics · mechanics
Problem
Problem 18 (Physics Cup 2012). A thin rod of mass m is placed in a corner so that the rod forms
an angle α with the floor. The gravitational acceleration is g, and the coefficient of friction with
the wall and floor is µ = tanβ, which is not large enough to keep the rod from slipping.
s
What is the minimum additional force F needed to keep the rod static?
Next, we consider some questions that train three-dimensional thinking.