What is the equation for kinetic friction?

Answer 1

Newton's first law states that, simply, an object in motion will stay in motion unless acted upon by an unbalanced force. It also gives the idea that an object that is at rest will stay at rest unless acted upon by an unbalanced force. Friction mostly has to do with the first part of Newton's first law. The unbalanced force can be practically anything, like a shoe or tree. If there isn't anything that is going to counteract with the moving object, it will still stop. Why? Friction. It counts as an unbalanced force because it interferes with the motion of the object and in addition to that, it moves in the opposite direction of the moving object.

Answer 2

First, I will assume your question is "What are the laws of kinetic friction?".

Second, I don't know if you are looking for a certain law about friction or a list of properties of friction. Anyway, I found this after a 5 second Google search, which you apparently could not do:

• Amontons' First Law: The force of friction is directly proportional to the applied load.

• Amontons' Second Law: The force of friction is independent of the apparent area of contact.
• Coulomb's Law of Friction: Kinetic friction is independent of the sliding velocity.

Answer 3

If two bodies do not slide over each other the force of static friction fs is given by fs<=msR.

If the bodies slide over each other the force of kinetic friction is given by fk=mkR.

The force of static frictions and the force of kinetic friction fk do not depend on the area of contact as long as the normal reaction R is same.

Answer 4

The third law of friction was proposed by Coulomb. It says, that friction in sliding of two solids (unlibricated) against one another is independent of the relative velocity of the sliding motion.

The law does not apply to very low velocities as, under such conditions, the friction force tends to decrease with the increase in sliding velocity until certain velocity is reached. Also with lubricant present (especially fluid) the friction resistance can be strongly dependent on both velocity and load.

Answer 5

There is no law of conservation of kinetic energy. The main reason for this is the fact

that kinetic energy is not necessarily conserved. Energy can change freely, back and forth,

between kinetic and potential. Just sit and watch a swinging pendulum some day when

you have the time.

Answer 6

Force of Friction = u x F u is the constant for that surface, and F is the force being applied