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Q:

What are some examples of static friction?

A:

Some examples of static friction between two substances or objects are: glass on glass, tire on concrete, tire on snow, tire on a wet surface and steel on steel. Friction is the force between two objects in contact with each other that will resist an attempt to move them. Static friction is the force that will resist the movement up until it is overcome by a greater force and the motion occurs.

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Static friction results from the interlocking irregularities present on the two surfaces in contact. This force will increase in response to an attempt to move the objects until it is overcome at the threshold of motion. Until that point, the static friction will be equal to the applied force. The friction that occurs after the point where motion is achieved is referred to as kinetic friction. Both the static friction and the kinetic friction between two substances or objects are measured by coefficients. Since a lesser degree of force is required to keep one object sliding over the other after the threshold of motion is reached, the coefficients for kinetic friction are typically less than those for static friction.

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Related Questions

• A:

Examples of fluid friction include hailstones falling from the atmosphere, the drag of air on an airplane, water slowing the speed of a boat, air slowing a bullet and fish swimming underwater. Fluid friction occurs around a solid object moving through a liquid or gas medium.

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• A:

Friction is a force that tends to stop motion or resist the motion of objects. Friction is always a negative force, which means it acts in a direction opposite to the direction of the force applied to the object. Movement of objects through air and liquids gives rise to friction.

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• A:

Friction is a force that opposes motion, so it is unhelpful in all situations where the motion of an object is desired. A by-product of friction is that energy is wasted in the form of heat, which can cause problems in temperature-sensitive environments.