CONTENTs INTRODUCTION CHAPTER 1 ENERGY BASICs 10 CHAPTER 2 CHEMICAL AND NUCLEAR ENERGY CHAPTER 3 ELECTRICAL RADIANT AND HEAT ENERGY 34 CHAPTER 4 THE CHANGING FORMS OF ENERGY I 48 CHAPTER 5 THE LAWS OF THERMODYNAMICS 58 67 CONCLUSION GLOSSARY FOR MORE INFORMATION 69 72 BIBLIOGRAPHY 75 INDEX 76
very day children around the world are encouraged by their parents to go outside and play to burn off some energy But in the world of physics energy is described in terms of work not play In phys ics energy equals the ability to do work Truth be told work means something a bit different to physicists than it does to the average person In their vocabulary work is not just doing tasks and keeping
INTRODUCTION busy For work to be involved there has to be some kind of force that causes an object to move Mathematically if the object is moved in the same direction as the force this is described as W F s work equals force times the distance represented by s moved In other words work is measured by how strong the force is and how far the object moves The more work done on an object the more energy it
