内容简介
INTRODUCTION
CHAPTER ONE:THE SCIENTIST AT WORK
1.What Is Science?
2.Observation
3.Instruments
4.Questions
5.Experimenting
6.Finding Answers
7.Stating a Problem
8.An Hypothesis
9.The Answer
10.Summing Up
CHAPTER TWO:EXPERIMENTING WITH ELECTRICITY
1.What Is Electricity?
2.Using Electricity
3.The Dry Cell
4.Sockets and Wires
5.Lighting a Bulb
6.A Complete Circuit and a Switch
7.Conductors and Nonconductors
8.A Short Circuit
9.A Fuse
10.Heat and Electricity
11.The Electric-Light Bulb
12.Wiring the Circuits
13.Batteries and Ways to Obtain Electricity
14.Adding Volts
15.Electricity in Review
CHAPTER THREE:USING MACHINES
1.AMachine
2.The Lever
3.Kinds of Levers
4.A Lever for Experimenting
5.Pulleys
6.Wheel and Axle
7.The Inclined Plane
8.The Screw
9.The Wedge
10.The Power Shovel
11.Elevators
CHAPTER FOUR:WORKING WITH CHEMICALS
1.Molecules and Atoms & Elements and Com-pounds
2.Matter and Change
3.Describing Chemical Changes
4."Breaking"a Compound & Making a Com-pound
5.Some Important Chemical Changes
6.Chemicals Every Day
CHAPTER FIVE:INTO SPACE WITH SATELLITES
1.Launching Satellites
2.Rocket Power
3.Satellite Rockets
4.Satellites—Up and Down
5.Satellite Instruments
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