Define Friction?

Answer 1

Friction is the force that opposes the relative motion or tendency of such motion of two surfaces in contact. It is also the contact of two objects creating static electricity. It is not, however, a fundamental force, as it originates from the electromagnetic forces and exchange force between atoms. In situations where the surfaces in contact are moving relative to each other, the friction between the two objects converts kinetic energy into sensitive energy, or heat (atomic vibrations). Friction between solid objects and fluids (gases or liquids) is called fluid friction.

The classical approximation of the force of friction known as Coulomb friction (named after Charles-Augustin de Coulomb) is expressed as:

,
where-

μ is the coefficient of friction,
N is the normal force to the contact surface,
Ff is the maximum possible force exerted by friction.
This force is exerted in the direction opposite the object's motion, thus it is an opposing force.

This law mathematically follows from the fact that contacting surfaces have atomically close contacts only over extremely small fraction of their overall surface area, and this contact area is proportional to load (until saturation which takes place when all area is in atomic contact thus no further increase of friction force takes place).

This simple (although incomplete) representation of friction is adequate for the analysis of many physical systems.

Answer 2

Friction is the force that opposes the relative motion or tendency of such motion of two surfaces in contact. It is also the contact of two objects creating static electricity. It is not, however, a fundamental force, as it originates from the electromagnetic forces and exchange force between atoms. In situations where the surfaces in contact are moving relative to each other, the friction between the two objects converts kinetic energy into sensitive energy, or heat (atomic vibrations). Friction between solid objects and fluids (gases or liquids) is called fluid friction.

Answer 3

Friction is a phenomenon by which a material offers resistance to other body when in contact when in motion

Answer 4

it is the force that opposes motion. Consider a stone lying on a floor. when it is at rest the electrostatic repulsion between the stone particles and the floor give rise to an upward force known as the normal contact force. When the stone is given a push the contact force becomes tilted. The vertical component of the tilted contact force becomes the normal contact force. The horizontal component of the tilted contact force thus is known as the friction force

Answer 5

force of static friction means the minimum force how need something for begin movement

Answer 6

Force that two surfaces exert on each other when they rub against each other

Answer 7

the force to resistant resist any motion or any trend of motion.