Physics 1205 Reading Questions
Assignment #5

Chapter 5.13 - 5.16, 6.0 - 6.6

Reading Questions should be submitted electronically using this form. They are due by 8:30 a.m. on Wednesday, October 1, 2008.
Any Reading Questions arriving late will receive no credit.
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Answer the Reading Questions below. Please answer each question.

1. Why is the force of kinetic friction equal to the coefficient of kinetic friction times the normal force, but the force of static friction is equal to or less than the coefficient of static friction times the normal force?

2. What is a pseudoforce?

3. We have talked about centripetal acceleration in the previous chapter. A centripetal force is really the result of a "net radial force." Please explain what this means. (This is not explicitly discussed in chapter 5 or 6, but is used in Example 5.10 and throughout chapter 6)

4. How far away from each other do two objects have to be before they no longer feel some gravitational attraction (force)?

5. How does the force of the earth acting on your body relate to the force of your body acting on the earth? Does the answer to this question come only from Newton's third law, Newton's law of gravity, or both?

6. What is the principle of linear superposition? How does it apply to gravitation?

7. How does Newton's law of universal gravitation lead to the fact that near the surface of the earth, all objects accelerate with the same acceleration g?

8. What does it mean when we say an object orbiting the earth is weightless? Does the object have weight?

9. What is the gravitational force inside a hollow sphere from the sphere?

10. How does the gravitational force outside of a hollow sphere compare with the gravitational force outside of a solid sphere when both spheres have the same mass?

Final Question: (This question must be answered to receive any credit). What is one thing from the reading that you didn't understand or need clarified?

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