Problems Involving Dry Friction


In this section, we will examine a wide range of problems involving dry friction. The important facts to remember are as follows:
  1. Friction force is shown in the opposite direction to that of impending motion.
  2. Only when we have a condition of impending sliding we can use the friction equation .
  3. If the location of the normal force at the surface of contact is unknown, we cannot use the moment equilibrium equation.

Example 1

Example 2

Example 3

Example 4

Example 5