Page 4 - Fisika Terapan for Engineers and Scientists

CHAPTER

7 Work and Energy

CONCEPTS IN CONTEXT
Concepts
in
The high-speed and high-acceleration thrills of a roller coaster are made Context
7.1 Work possible by the force of gravity. We will see that gravity does work on the
7.2 Work for a Variable Force roller-coaster car while it descends, increasing its kinetic energy.
To see how energy considerations provide powerful approaches for
7.3 Kinetic Energy
understanding and predicting motion, we will ask:
7.4 Gravitational Potential
Energy ? 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 deter-
mined in a simple way? (Example 8, page 222; and Checkup 7.4,
question 1, page 224)
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