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C H A P T E R   4 Forces and Newton's Laws of Motion

C H A P T E R   4 Forces and Newton's Laws of Motion. 4.9  Static and Kinetic Frictional Forces. 4.9  Static and Kinetic Frictional Forces. There are situations where friction helps us and at other times it is a hindrance. 4.9  Static and Kinetic Frictional Forces.

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C H A P T E R   4 Forces and Newton's Laws of Motion

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  1. C H A P T E R   4Forces and Newton's Laws of Motion

  2. 4.9 Static and Kinetic Frictional Forces

  3. 4.9 Static and Kinetic Frictional Forces There are situations where friction helps us and at other times it is a hindrance.

  4. 4.9 Static and Kinetic Frictional Forces There are situations where friction helps us and at other times it is a hindrance. Advantages of friction:

  5. 4.9 Static and Kinetic Frictional Forces There are situations where friction helps us and at other times it is a hindrance. Advantages of friction: Disadvantages of friction: wear and tear & energy loss.

  6. Microscopic view of Frictional Forces

  7. Frictional force VERSUS Applied force

  8. Frictional force VERSUS Applied force

  9. Static Frictional Force The magnitude fs of the static frictional force can have any value from zero up to a maximum value of fsMAX, depending on the applied force. fs≤fsMAX fsMAX = msFN

  10. Kinetic Frictional Force The magnitude fk of the kinetic frictional force is given by,

  11. Coefficients of Friction

  12. EXAMPLE 10 Sled Riding A sled is traveling at 4.00 m/s along a horizontal stretch of snow, as Figure 4.23a illustrates. The coefficient of kinetic friction is mk = 0.0500. How far does the sled go before stopping?

  13. 4.10 The Tension Force

  14. Free-body Diagram

  15. Object on an Inclined Plane

  16. Object on an Inclined Plane

  17. Problem-73 A cable is lifting a construction worker and a crate, as the drawing shows. The weights of the worker and crate are 965 and 1510 N, respectively. The acceleration of the cable is 0.620 m/s2, upward. What is the tension in the cable (a) below the worker and (b) above the worker?

  18. Free-Body Diagram

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