Q:

Why does friction occur?

A:

Quick Answer

Friction is caused by the bumps on the surface of one object colliding with the bumps of another object's surface. All surfaces have bumps, created by their molecular structure. These bumps may only be visible on objects with seemingly smooth surfaces through the use of a microscope.

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Full Answer

There are two types of friction: static and kinetic. Static friction occurs when objects are not moving. The resistance encountered when trying to push a heavy object across a surface is an example of static friction. Kinetic friction occurs as two objects rub against each other. Kinetic friction produces energy in the form of heat.

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Related Questions

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    Why does oil reduce friction?

    A:

    Oil reduces friction because it acts as a lubricant, smoothing and cushioning bumps between rough surfaces while also flowing past itself in parallel layers. This second form of lubrication, in which oil moves in multiple directions simultaneously, is referred to as laminar flow.

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  • Q:

    What two things does friction depend on?

    A:

    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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    What are examples of external forces?

    A:

    Examples of external forces include the force applied to the system, air resistance of an object, force of friction, tension and normal force. Internal forces include the force of gravity, spring force, and magnetic and electrical field forces. Forces are either internal or external.

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    What causes air resistance?

    A:

    Air resistance is caused by friction between a moving object and the air molecules surrounding it. The energy required to push these molecules out of the way diminishes the object's kinetic energy and correspondingly reduces its velocity.

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