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# What are types of friction?

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There are four general types of friction: static, kinetic, rolling and fluid. Friction is defined as the force that resists the motion of two objects sliding against each other.

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Static friction occurs when an object is forcefully moved along a surface and no movement takes place. The direction of the force is in the direction opposite of the motion. Kinetic friction takes place when an object just starts to move across another surface. Rolling friction is defined as the force that slows down the movement of a rolling object. Fluid friction is the restrictive force that slows down the movement of an object in liquid.

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## Related Questions

• A:

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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• A:

The main source of attraction between two metals, or adhesion, is what causes friction, and any increase of friction requires an increase in adhesion. Friction itself is the force of resistance against two objects as one object slides or rolls over another. This force increases the amount of energy required to move an object a set distance.

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When an object slides across the ground, it has much more surface area in direct contact with the ground, which means that the amount of friction is significantly higher. When an object rolls along the ground, only a minuscule point on the object contacts the ground at any point in time, making the stopping force much weaker.