The Forces of Nature

previewtUI'~]['-IF ][Physics is the science of the behavior of matter and energy.In this first book of physics, you will study the forces (inter.actions) of electricity, magnetism, and heat energy. Have you ever wondered why magnets form an importantpart of motors and telephone systems? Have you everthought about the relationship between magnetism and elec-tricity? Do you understand the difference between heat andtemperature? In the last 150 years, scientists have been able to findthe answers to such questions--but only through manyyears of patient and careful experimentation. These peopleare called physicists. They have developed measuring de-vices and instruments more sensitive than their five senses.Like most scientists, physicists use a method in finding so-lutions to their questions.In this first unit, we will review ~ the general characteristics of science. ~ how scientists develop answers to questions about the laws of nature. ~ some basic ideas that control our universe.And just as important, you will ~ learn to respect the scientific method by which you study the environment. ~ learn how to use instruments and tools--the apparatus of science.begin to appreciate the importance of precise measure-ments.~ see the value of record keeping in science.3