Which of the following does the force of friction NOT depend?
-the nature of the two surfaces in contact
-the surface area of the two surfaces in contact
-the normal force pressing the two surfaces together
-smoothness of the two surfaces
Which of the following does the force of friction NOT depend?
-the nature of the two surfaces in contact
-the surface area of the two surfaces in contact
-the normal force pressing the two surfaces together
-smoothness of the two surfaces