What is Frictional Force?

Question

Can you please give me a page fescription about Frictional Force?

Also tell me the best web site to search for info..(except google, yahoo)

Answer 1

when two bodies are kept in contact, electromagnetic forces act between the charged particles at the surfaces of the bodies. as a result each body exerts a contact force on each other. the magnitudes of the contact forces acting between them is equal. but the direction are opposite. hence, the follow newtons third law.
the direction fo the contact force acting on a body is not necessarily perpendicular to the contact surface. we can resolve this contact force into 2 components. 1 perpendicular to the contact other parallel to it. THE PERPENDICULAR COMPONENT IS CALLED NORMAL CONTACT FORCE AND PARALLEL COMPONENT IS CALLED FRICTIONAL FORCE.
there r 2 types of frictinal force,(1) kinetic,(2)static friction.
STATIC FRICTION....... friction due to which body remains at rest with respect to another body.
KINETIC FRICTION.......when a body is in motion with another body the friction created due to this motin is called kinetic friction.



friction cannot occur without contact. without friction a body cannot move as friction is opposite to the direction of motion.

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Answer 2

Any thing that hinders motion is called friction.