## Chapter 7: Work and Energy

### Study Plan

To see how energy considerations provide powerful approaches for understanding and predicting motion, we will ask:

• What is the work done by gravity when the roller-coaster car descends along an incline? (Example 3, page 209)
• As a roller-coaster car travels up to a peak, over it, and then down again, does gravity do work? Does the normal force? (Checkup 7.1, question 1, page 210)
• For a complex, curving descent, how can the final speed be determined in a simple way? (Example 8, page 222; and Checkup 7.4, question 1, page 224)

#### Organize

1. Prepare for lecture by reading the assigned sections from Chapter 7 in your textbook or ebook. This will provide an organizing framework for concepts introduced in lecture, and help you take better notes.
2. Take the checkup quiz and work the Checkup questions in your textbook to assess your understanding of basic concepts. Take note of any topics you need to review further.
3. Review the Examples from your textbook. These progress from simple to complex, and provide concrete illustrations of the concepts discussed.
4. Review the Problem Solving Techniques box on Calculation of Work and on Energy Conservation in Analysis of Motion from your textbook.
5. Review the Math Help box on Integrals from your textbook.

#### Learn

2. Access the Online Concept Tutorials given for this chapter. Tutorials use animation and interactive exercises to help develop your understanding of fundamental topics.
Work of a Variable Force
Sections: 7.1, 7.2, 7.4
3. Use the FlashCards to test your memory for new key terms and equations.
4. Work the end of chapter Problems and Review Problems assigned by your instructor. If your instructor has assigned SmartWork online homework, login from the right navigation pane.

#### Connect

1. Physics in the News offers additional real-world physics applications, and a daily dose of science-based news.