Page 138 - Fisika Terapan for Engineers and Scientists

CHAPTER

11 Collisions

CONCEPTS IN CONTEXT Concepts
in
In this crash test, the automobile was towed at a speed of 56 km/h (35 mi/h) Context
11.1 Impulsive Forces and then crashed into a rigid concrete barrier. Anthropomorphic dummies
11.2 Elastic Collisions in One that simulate human bodies are used for evaluation of injuries that would be sustained
Dimension by driver and passengers. Accelerometers installed on the body of the automobile and
11.3 Inelastic Collisions in One the bodies of the dummies permit calculation of impact forces.
Dimension With the concepts of this chapter we can answer questions such as:
11.4 Collisions in Two and Three ? What is the average force on the front of an automobile during impact?
Dimensions
(Example 1, page 341)
? What is force on the head of a dummy during a collision with the windshield or the
steering wheel? (Example 2, page 341)
? How do seat belts and air bags protect occupants of an automobile in a crash?
(Physics in Practice: Automobile Collisions, page 343)
? How does the stiffness of the front end of an automobile affect the safety of its
338 occupants in a collision? (Checkup 11.1, question 1, page 344)