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Friction

Friction. Instructor: Shelia Chase. Definition. Friction Force ( Ffrict ): The force exerted by a surface as an object moves across it. There are at least two types of friction force - sliding and static friction.

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Friction

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  1. Friction Instructor: Shelia Chase

  2. Definition Friction Force (Ffrict): The force exerted by a surface as an object moves across it. There are at least two types of friction force - sliding and static friction.

  3. The friction force often opposes the motion of an object. For example, if a book slides across the surface of a desk, then the desk exerts a friction force in the opposite direction of its motion. Friction results from the two surfaces being pressed together closely, causing intermolecular attractive forces between molecules of different surfaces.

  4. Friction depends upon the nature of the two surfaces and upon the degree to which they are pressed together. The maximum amount of friction force that a surface can exert upon an object can be calculated using the formula: Ffrict = µ • Fnorm

  5. Friction On Inclined Planes and Other Types of Friction Eureka! Mechanical Advantage and Friction

  6. Practice

  7. Homework Print off the Friction Lesson 22 worksheet, complete and we will review them together during the next lesson.

  8. Physics is fun!

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