The Physics of War

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Authors: Barry Parker

BOOK: The Physics of War
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Published 2014 by Prometheus Books

The Physics of War: From Arrows to Atoms
. Copyright © 2014 by Barry Parker. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, digital, electronic, mechanical, photocopying, recording, or otherwise, or conveyed via the Internet or a website without prior written permission of the publisher, except in the case of brief quotations embodied in critical articles and reviews.

Interior artwork by Lori Scoffield Beer

Cover image © 2013 Media Bakery and BIGSTOCK

Jacket design by Grace M. Conti-Zilsberger

Inquiries should be addressed to

Prometheus Books

59 John Glenn Drive

Amherst, New York 14228–2119

VOICE: 716–691–0133

FAX: 716–691–0137

WWW.PROMETHEUSBOOKS.COM

18 17 16 15 14      5 4 3 2 1

Library of Congress Cataloging-in-Publication Data Pending

ISBN 978-1-61614-803-4 (hardcover)

ISBN 978-1-61614-804-1 (ebook)

Printed in the United States of America

PREFACE

CHAPTER 1: INTRODUCTION

Summary of the Book

CHAPTER 2: EARLY WARS AND THE BEGINNING OF PHYSICS

Battle of Kadesh

The Wonder Weapon

Copper, Bronze, and Iron

The Assyrians

Greeks and the Beginning of Physics

The New Wonder Machines

Alexander the Great

Archimedes

CHAPTER 3: BASIC PHYSICS OF EARLY WEAPONS

Velocity and Acceleration

Force and Inertia

Momentum and Impulse

The Effect of Gravity

Energy and Power

Angular Momentum and Torque

Machines

Physics of the Bow and Arrow

Physics of Other Early Weapons

CHAPTER 4: THE RISE AND FALL OF THE ROMAN EMPIRE AND THE EARLY ENGLISH-FRENCH WARS

The Romans and Their Weapons

Early English-French Wars

Origin and Physics of the Longbow

CHAPTER 5: GUNPOWDER AND CANNONS: THE DISCOVERIES THAT CHANGED THE ART OF WAR AND THE WORLD

Roger Bacon

Development of the Cannon

The Hundred Years' War

The Basilica and the Siege of Constantinople

Cannons in the English-Scottish Wars

The French

Charles VIII and Victory over Naples

CHAPTER 6: THREE MEN AHEAD OF THEIR TIME: DA VINCI, TARTAGLIA, AND GALILEO

Leonardo and Physics

Leonardo's Military Inventions

Leonardo's Attitude toward War

Tartaglia

Galileo

CHAPTER 7: FROM EARLY GUNS TO TOTAL DESTRUCTION AND DISCOVERY

The Guns of War

The War at Sea

Henry VIII of England

William Gilbert

The Problem of Longitude

The Thirty Years' War

Swedish Intervention

A New Era of Discovery: Isaac Newton

CHAPTER 8: THE IMPACT OF THE INDUSTRIAL REVOLUTION

Introduction

The French Revolution

The English Revolution

James Watt and the Steam Engine

John “Iron Mad” Wilkinson

Benjamin Robins

The Flintlock

Christiaan Huygens

Physics and the Industrial Revolution

CHAPTER 9: NAPOLEON'S WEAPONS AND NEW BREAKTHROUGHS IN PHYSICS

The French Revolution

Jean-Baptiste Vaquette de Gribeauval

Napoleon and His Weapons

Count Rumford

New Breakthroughs in Physics

How This Affected Warfare

CHAPTER 10: THE AMERICAN CIVIL WAR

Development of the Percussion Cap

The Minié Ball

A Revolution in Rifles and Cannons

The War

The Role of the Telegraph

The Dynamo (Generator)

The Gatling Gun

The War at Sea

Physics of the Propeller

“Damn the Torpedoes”

Submarines

Balloons

CHAPTER 11: WHERE DOES THE BULLET GO? BALLISTICS OF RIFLE BULLETS AND CANNON SHELLS

Internal Ballistics

Recoil

Transitional Ballistics and the Sonic Boom

External Ballistics

Stability of the Bullet

Terminal Ballistics

CHAPTER 12: HEY, LOOK…IT FLIES! AERODYNAMICS AND THE FIRST AIRPLANES

Discoveries That Led to the Airplane

The Wright Brothers

What Makes an Airplane Fly?

The Physical, More Exact Explanation of Lift

Details of Drag

Steering and Maneuvering the Airplane

First Use of Airplanes in War

CHAPTER 13: THE MACHINE GUN WAR—WORLD WAR I

Development of the Machine Gun

Other Weapons

How the War Started

The First Warplanes

The War at Sea and the Menace beneath the Sea

The Final Horror—Poisonous Gas

The First Tanks

America Enters the War

CHAPTER 14: THE INVISIBLE RAYS: THE DEVELOPMENT AND USE OF RADIO AND RADAR IN WAR

The Production and Detection of Electromagnetic Waves

The Electromagnetic Spectrum

Radio Waves

X-rays

Light and Infrared

Radar

An Amazing Discovery

CHAPTER 15: SONAR AND THE SUBMARINE

Archimedes' Principle

Physics of Submarines

Power for the Propellers

Shape and Periscopes

Navigation

Sonar

Torpedoes

How Torpedoes Work

Submarines in World War II

CHAPTER 16: THE GREAT WAR: WORLD WAR II

How the War Started

Ready for War

The Battle of France, and Dunkirk

The Radar Advantage

The Battle of Britain

American Entry into the War

Advances in Aviation

The First Rockets in War

Other Weapons and Small Arms

Computers and Intelligence

CHAPTER 17: THE ATOMIC BOMB

The Beginning

Einstein's Role

The Italian Breakthrough

Hahn, Meitner, and Strassmann

Christmas 1938

A Chain Reaction

The Letter to Roosevelt

The War Begins

Meanwhile in England

Heisenberg and Bohr

The Manhattan Project

The First Reactor

The Continuing Manhattan Project

Trinity

The German Bomb

Decision to Use the Bomb on Japan

CHAPTER 18: THE HYDROGEN BOMB, INTERCONTINENTAL MISSILES, LASERS, AND THE FUTURE

Development of the Hydrogen Bomb

The Ulam-Teller Breakthrough

The First Test: Mike

Physics of the Hydrogen Bomb

Long-Range Missiles

Other Weapons: Lasers

Transistors, Microchips, and Computers

Satellites and Drones

Futuristic Weapons of War

NOTES

SELECTED BIBLIOGRAPHY

INDEX

I mentioned to a friend that I was writing a book on the physics of war. “What does physics have to do with war?” he asked. “Oh, you mean the atomic bomb,” he added. And indeed most people know that physics had something to do with the atomic bomb. But in reality it has made many contributions other than the atomic bomb, and not all of them have led to the creation of offensive weapons that have caused damage and grief. It has also been helpful for defense, and one of the best examples of this was the invention of radar just before World War II. It allowed the British to track incoming German planes and take action to defend themselves. The invention of radar no doubt saved thousands of lives during the Battle of Britain. The discovery of x-rays by Röntgen has also played a large role in war, and there's no doubt that it has saved lives.

And it's not just modern weapons that have been based on the principles of physics. Even though they knew little physics, early civilizations, such as the Egyptians, Assyrians, Greeks and Romans, used physics in devising their weapons. Indeed, all through history physics has played an important role in the development of weapons.

As the basic principles of physics were discovered by such people as Galileo, Newton, Huygens, Einstein, and others, it became a science that was solidly based on a firm foundation. At the same time, however, it became more complex and more difficult for the layperson to understand. But it is important that people other than scientists understand, at least to some degree, what is going on in the world of science, and I'm hoping that the present book will help in this respect. I would like to also mention that although physics has been used extensively in war, it has been found to have many applications for the betterment of humankind.

In as many places as possible I've tried to use a story format to make the book more readable and interesting. I've used a few formulas; I hope they don't scare you. I've added them for anyone that is particularly interested in the details of the physics behind the weapons. You can ignore them without losing much.

Finally, I would like to thank my artist, Lori Beer, for an excellent job on the diagrams. I'm sure they will be helpful to most people.

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