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Friction

Friction. AP Physics Notes. 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. Friction. Symbol. Unit. Depends on.

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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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