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Chapter 5 – part A

Chapter 5 – part A. Forces of Friction Dynamics of Circular Motion. Forces of Friction. Friction f F is the first force you study that is not constant: It adjusts itself to stop the relative motion between bodies It has a maximum value. REACTION FORCE. Exercise 5.2.

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Chapter 5 – part A

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  1. Chapter 5 – part A Forces of Friction Dynamics of Circular Motion

  2. Forces of Friction • Friction fFis the first force you study that is not constant: It adjusts itself to stop the relative motion between bodies • It has a maximum value REACTION FORCE

  3. Exercise 5.2 2. A car is traveling at 50.0 mi/h on a horizontal highway. (a) If the coefficient of static friction between road and tires on a rainy day is 0.100, what is the minimum distance in which the car will stop? (b) What is the stopping distance when the surface is dry and μs= 0.600?

  4. Exercise 5.8 8. A woman at an airport is towing her 20.0-kg suitcase at constant speed by pulling on a strap at an angle θ above the horizontal (Fig. P5.8). She pulls on the strap with a 35.0-N force, and the friction force on the suitcase is 20.0 N. Draw a free-body diagram of the suitcase. (a) What angle does the strap make with the horizontal? (b) What normal force does the ground exert on the suitcase?

  5. Exercise 5.10 10. A 9.00-kg hanging block is connected by a string over a pulley to a 5.00-kg block that is sliding on a flat table (Fig. P5.10). The string is light and does not stretch; the pulley is light and turns without friction. The coefficient of kinetic friction between the sliding block and the table is 0.200. Find the tension in the string.

  6. Exercise 5.17 17. A crate of eggs is located in the middle of the flatbed of a pickup truck as the truck negotiates an unbanked curve in the road. The curve may be regarded as an arc of a circle of radius 35.0 m. If the coefficient of static friction between crate and truck is 0.600, how fast can the truck be moving without the crate sliding?

  7. Exercise 5.20 20. A 4.00-kg object is attached to a vertical rod by two strings as shown in Figure P5.20. The object rotates in a horizontal circle at constant speed 6.00 m/s. Find the tension in (a) the upper string and (b) the lower string.

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