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Chapter 5: Further Applications of Newton's Laws: Friction, Drag, and Elasticity

College Physics (Urone)
Pages: 167 - 190

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20 Questions for Chapter 5: Further Applications of Newton's Laws: Friction, Drag, and Elasticity

  1. What are you feeling when you feel your pulse? Measure your pulse rate for 10 sand for1min. Is there a factor of 6 difference?

    Found on Page 187
  2. Examine different types of shoes, including sports shoes and thongs. In terms of physics, why are the bottom surfaces designed as they are? What differences will dry and wet conditions make for these surfaces?

    Found on Page 187
  3. Explain why pregnant women often suffer from back strain late in their pregnancy.

    Found on Page 187
  4. When you push a piece of chalk across a chalkboard, it sometimes screeches because it rapidly alternates between slipping and sticking to the board. Describe this process in more detail, in particular explaining how it is related to the fact that kinetic friction is less than static friction. (The same slip-grab process occurs when tires screech on pavement.)

    Found on Page 186
  5. Calculate the deceleration of a snow boarder going up a5.0, slope assuming the coefficient of friction for waxed wood on wet snow. The result ofExercise5.1may be useful, but be careful to consider the fact that the snow boarder is going uphill. Explicitly show how you follow the steps inProblem-Solving Strategies.

    Found on Page 188
  6. Define normal forces. What is its relationship to friction when friction behaves simply?

    Found on Page 186
  7. A physics major is cooking breakfast when he notices that the frictional force between his steel spatula and his Teflon frying pan is only 0.200 N. Knowing the coefficient of kinetic friction between the two materials, he quickly calculates the normal force. What is it?

    Found on Page 188
  8. The glue on a piece of tape can exert forces. Can these forces be a type of simple friction? Explain, considering especially that tape can stick to vertical walls and even to ceilings.

    Found on Page 186
  9. (a) When rebuilding her car’s engine, a physics major must exert 300 Nof force to insert a dry steel piston into a steel cylinder. What is the magnitude of the normal force between the piston and cylinder?

    Found on Page 188
  10. When you learn to drive, you discover that you need to let up slightly on the brake pedal as you come to a stop or the car will stop with a jerk. Explain this in terms of the relationship between static and kinetic friction.

    Found on Page 186

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