Question

A student is subjected to a reaction force of 10 N northward from a 5 kg block while pushing the block over a smooth, level suface. Ignoring friction, what is the acceleration of the block?

Answer 1

Answer:

The Analysis Model approach we focus on in this revision lays out a standard set of situations that appear in most

physics problems. These situations are based on an entity in one of four simplification models: particle, system,

rigid object, and wave. Once the simplification model is identified, the student thinks about what the entity is

doing or how it interacts with its environment. This leads the student to identify a particular Analysis Model for the

problem. For example, if an object is falling, the object is recognized as a particle experiencing an acceleration due

to gravity that is constant. The student has learned that the Analysis Model of a particle under constant acceleration

describes this situation. Furthermore, this model has a small number of equations associated with it for use in starting problems, the kinematic equations presented in Chapter 2. Therefore, an understanding of the situation has led

to an Analysis Model, which then identifies a very small number of equations to start the problem, rather than the

myriad equations that students see in the text. In this way, the use of Analysis Models leads the student to identify

the fundamental principle. As the student gains more experience, he or she will lean less on the Analysis Model

approach and begin to identify fundamental principles directly.

To better integrate the Analysis Model approach for this edition, Analysis Model descriptive boxes have been

added at the end of any section that introduces a new Analysis Model. This feature recaps the Analysis Model introduced in the section and provides examples of the types of problems that a student could solve using the Analysis

Model. These boxes function as a “refresher” before students see the Analysis Models in use in the worked examples

for a given section.

Worked examples in the text that utilize Analysis Models are now designated with an AM icon for ease of reference. The solutions of these examples integrate the Analysis Model approach to problem solving. The approach is

further reinforced in the end-of-chapter summary under the heading Analysis Models for Problem Solving, and through

the new Analysis Model Tutorials that are based on selected end-of-chapter problems and appear in Enhanced

WebAssign.

Analysis Model Tutorials. John Jewett developed 16

Explanation: