ABSTRACT
Newton’s laws have been introduced in Chapter 4, where they were applied to numerous cases of motion. Naturally, there are many kinds of forces that generate motion. They are elastic forces such as tension and spring forces, resistive forces such as air resistance and frictional forces that impede motion, gravitational forces such as those manifested by weights of objects, and collision forces that are common examples of the forces usually treated in a mechanics textbook. As Newton’s laws are universal for velocities much smaller than the speed of light, they can be applied to all kinds of forces, including resistive forces such as friction. In this chapter, friction is handled in detail in two main kinds of motion, linear motion and circular motion. The dynamics of linear and circular motions where friction is involved displays several interesting features that warrant a separate treatment. This is discussed separately in this chapter instead of including it in Chapter 4.
