Q:

What are types of friction?

A:

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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    What is the coefficient of friction of rubber?

    A:

    The coefficient of friction of rubber depends upon the surface in contact with the rubber. Rubber against rubber results in a static coefficient of friction of 1.15, whereas rubber against asphalt results in a static coefficient of friction of 0.9.

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    Why does friction occur?

    A:

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    What is sliding friction?

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    What is fluid friction?

    A:

    Fluid friction is the resistance to an object's motion through a liquid or gas. When the motion is occurring in a liquid, it is referred to as viscous resistance. Resistance to an object moving through a gas, such as air, is termed air friction.

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