Q1. What is Friction?

Friction is a resistance force that opposes the slipping motion of

  1. a body relative to another body with which it is in contact
  2. a body relative to the surface with which it is in contact

Other Frequently Asked Questions

Q2. What are the basic characteristics of friction?
Q3. Is there more than one kind of friction?
Q4. What is the difference between static friction and kinetic friction?
Q5. Is it OK to always assume that the friction force is equation?