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Text illustrations Janet Moneymaker, Rebecca W. Keller, PhD Copyright 2013 Gravitas Publications, Inc. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system

Contents iii CHAPTER 1 WHAT IS PHYSICS 1. 1 1.2 1.3 1.4 1.5 What Goes Up Comes Down Obey the Rules Who Makes the Rules Think Like a Scientist Summary 2 3 4 5 6 1 CHAPTER 2 PUSH AND PULL 2. 1 2.2 2.3

iv Contents CHAPTER 6 ELECTRICITY 6. 1 6.2 6.3 6.4 6.5 Introduction Electrons Electrons and Charge Electrons and Force Summary 37 37 39 40 42 44 45 47 49 51 52 56 57 59 61 63 64 66 67 69 71 73 36

2 Focus On Elementary Physics 1.1 What Goes Up Comes Down Have you ever thrown a ball up in the air Did you notice the ball when it left your hand What did it do Did it go up Did it come back down U

Chapter 1 What Is Physics 3 All of these questions are questions about physics. Physics is the branch of science that asks questions about how far or how high a ball might go or how heavy it needs t

4 Focus On Elementary Physics There are rules for the way things, like balls, behave. The rule what goes up comes down is a rule about gravity. Gravity is what makes the ball come back down. Gravity

Chapter 1 What Is Physics 5 how things moved. He is known for a famous experiment in which he dropped two balls off a building to see what would happen. He used a heavy ball and a light ball, and he

6 Focus On Elementary Physics Where does it come out What is moving on the machine What is staying still Notice the popcorn when it comes out. Is it hot or is it cold These are important observation