Book cover for Physics

Physics

Alan Giambattista, Betty McCarthy Richardson, Robert C. Richardson

ISBN #9780073404530

2nd Edition

2,795 Questions

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Summary

Learning Objectives

Key Concepts

Example Problems

Explanations

Common Mistakes

Summary

This textbook section covers a broad spectrum of topics centered on force and Newton’s laws. It emphasizes the importance of representing forces as vectors and resolving them into components to analyze equilibrium and acceleration. Students learn how free-body diagrams, friction (both static and kinetic), tension, gravitational forces, air resistance, and apparent weight interplay in different physical scenarios. Mastery of these concepts is essential for solving problems ranging from inclined plane dynamics to pulley systems and understanding the fundamental forces that govern nature.

Learning Objectives

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Key Concepts

CONCEPT

DEFINITION

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Example Problems

Example 1

A person is standing on a bathroom scale. Which of the following is not a force exerted on the scale: a contact force due to the floor, a contact force due to the person's feet, the weight of the person, the weight of the scale?

Example 2

A sack of flour has a weight of $19.8 \mathrm{N} .$ What is its weight in pounds?

Example 3

An astronaut weighs 175 lb. What is his weight in newtons?

Example 4

Does the concept of a contact force apply to both a macroscopic scale and an atomic scale? Explain.

Example 5

A force of $20 \mathrm{N}$ is directed at an angle of $60^{\circ}$ above the $x$ -axis. A second force of $20 \mathrm{N}$ is directed at an angle of $60^{\circ}$ below the $x$ -axis. What is the vector sum of these two forces?

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Step-by-Step Explanations

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Common Mistakes

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