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Friction

Friction is a force that opposes motion, acting against the applied force when a body rests on a rough surface. This resistance plays a crucial role in determining how easily an object can move. The frictional force (Ff) is measured in Newtons and depends on the weight of the object and the nature of the surfaces in contact. Static and kinetic friction are distinct types, with different coefficients indicating how slippery or sticky a surface is. This note also includes practical examples, calculations, and the impact of friction on inclined planes.

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Friction

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  1. Friction AP Physics Notes

  2. Friction Description • A force that opposes motion. • When a force is applied to a body resting on a rough plane so that the body moves or tends to move, a frictional force acts on the body in opposition to the applied force.

  3. Friction Symbol Unit Depends on Ff Newtons (it’s a force!) Weight of object (normal force Nature of the surfaces between the moving object and the supporting surface.

  4. Friction Static Sliding (kinetic) • Pushing the piano but no motion • Piano moves

  5. Friction Note: • Low coefficient = slippery • High coefficient = sticky • Fn = Normal force dependent on weight vector

  6. Examples of coefficient of Friction

  7. Stages of friction

  8. Friction practice • If it takes 200 N to move a 100 kg box across a flat floor at constant speed, what is the coefficient of friction?

  9. Incline Plane with Friction

  10. FBD

  11. Practice 2 • What is the force of friction between a 105 kg crate on a plane inclined at 30 degrees, with a coefficient of friction of 0.3?

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