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# What is kinetic friction?

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### Quick Answer

Kinetic friction refers to the frictional force of a moving object. If a force is being applied on a stationary object, friction is considered a static force until movement occurs.

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### Full Answer

Friction is a force that occurs between two or more surfaces of objects that is typically in the direction opposite to the force being applied on an object. It can be calculated by multiplying the coefficient of friction by the normal force, which takes into account gravity and any other forces perpendicular to the surfaces in contact. The static coefficient of friction is used when the object is stationary, and is usually larger than the kinetic coefficient of friction, which is used during movement.

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## Related Questions

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Friction happens when one object slides along another object. It is the force that resists the relative motion between the two surfaces. Friction occurs in the opposite direction of the moving object's motion and reduces its speed.

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Since friction opposes movement, it causes resistance that makes it harder for a sliding object to move, thus slowing down movement. Friction can be seen through the example of a car making a stop; the wheels and breaks cause friction, making the car slow down. In addition to affecting solid objects, friction also causes resistance with glass and liquids by causing a collision that results in heat.

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Two things influence the amount of friction on an object: the force that is pushing the two materials together and the nature of the surfaces of the two materials. Various interactions between these two aspects can produce variances in friction.

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Friction works to slow the momentum of a moving object. It acts as an impeding force, to either slow it down or eventually cause the object to stop moving.

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