CONTENTS
Acknowledgments vi
Physics Dictionary vii
Preface ix
Being in equilibrium 1
Equilibrium 4
Vectors 7
The Sailboat 10
Tension, Compression, Arches and Domes 12
Linear Motion 14
Speed 16
Speed Is Relative 17
Velocity . 18
The Usefulness of Equations in Problem Solving 20
Acceleration 21
Free Fall—How Fast? 25
How Far? 28
Hang Time 31
Velocity Vectors 33
Newton's lows of Motion 37
Newton's First Law of Motion 38
Mass 40
Net Force 44
Friction 44
Newton's Second Law of Motion 45
Applying Force—Pressure 48
Free Fall—When Acceleration is g 49 Non-free Fall—When Acceleration is Less Than g 52
Newton's Third Law of Motion 56
Systems of Forces 59 Acceleration and Newton's Third Law 60
Rocket Propulsion 62
Air Flight 62
Summary of Newton's Three Laws 63
Momentum 65
Impulse Changes Momentum 65
Bouncing 69
Conservation of Momentum 70
€nergy 78
Work 79
Work Changes Energy 80
Potential Energy 81
Kinetic Energy 83
Conservation of Energy 86
Power 87
Machines 88
Efficiency 90 Kinetic Energy and Momentum Compared 91
Energy Sources 93
Rotational Motion 97
Rotational Inertia 98
Torque 101 Center of Mass and Center of Gravity 103
Locating the Center of Gravity 104
Stability 106
Angular Momentum 107
Conservation of Angular Momentum 109
Railroad Train Wheels 112
Rotational Motion Activities 113
7 Gravity 115
The Universal Law of Gravitation 115
G: The Universal Gravitational Constant 117 Gravity and Distance: The Inverse-Square Law 119
Force Fields 121
Tides 124
Tides on the Moon 127
Weight and Weightlessness 128
Black Holes 129
Universal Gravitation 132
8 Projectile and Satellite Motion 135
Projectile Motion 135
Satellite Motion 142
Calculating Satellite Speed 145
Circular Orbits 147
Elliptical Orbits 149
Kepler's Laws of Planetary Motion 153
Energy Conservation and Satellite Motion 154
Escape Speed 155
On Science 160
Mathematics—The Language of Science 161
The Language of Science in Words 163
The Scientific Method 165
Pseudoscience 169
Science, Art, and Religion 171
Science and Technology 173
In Perspective 175
Index of Names 177
General Index 177