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Frictional force is the force that resists the movement of two surfaces that are in contact with each other. It is caused by the microscopic irregularities on the surfaces and the interlocking of these irregularities.
The formula for calculating frictional force is μ × N, where μ is the coefficient of friction and N is the normal force acting between the two surfaces.
The factors that affect frictional force include the type of surfaces in contact, the roughness of the surfaces, the force pressing the surfaces together, and the speed at which the surfaces are moving.
Frictional force acts in the opposite direction of motion, which means it always resists the movement between two surfaces. This can slow down or stop an object's motion, or cause it to change direction.
Frictional force can be reduced by using lubricants, making surfaces smoother, reducing the force pressing the surfaces together, or by using wheels and rollers to minimize the contact area between surfaces.
