Friction - Practice Questions & MCQ

Laws of friction

• The friction of the moving object is proportional to the normal force( numerically equal to pressing force).

                                                                        $f \propto N$

• The friction experienced by the object is dependent on the nature of the surface it is in contact with.  
• Friction is independent of the area of contact as long as there is an area of contact(as for solid apparent area is not equal to actual area of contact).
• It acts tangentially along with the contact.
• The direction of friction is always opposite to the direction of relative motion.
• It can be also defined as the component of contact force which is parallel to the surfaces in contact.

Types of friction;-

• Static Friction
• Kinetic Friction