OpenStax
Open Stax: Friction
In the following interactive students will begin to discuss the general characteristics of friction and describe the various types of it. They will also calculate the magnitude of static and kinetic friction.
Texas Education Agency
Texas Gateway: 5.1 Further Applications of Newton's Laws: Friction
By the end of this section, you will be able to discuss the general characteristics of friction, describe the various types of friction, and calculate the magnitudes of static and kinetic frictional forces.