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Does air have weight? How does a seesaw work? What keeps you from floating into space? There are so many things to measure in the world around you. The ideas introduced in this book will help you perform exciting and fun experiments. Some will even give you ideas for your science fair. All you need are some simple materials, most of which can be found around your home, school, or neighborhood. You will then be ready to discover the world of weight!

Introduction

Safety First

Weighing In

More Weighing In

Weight and Position

Gravity and Different Weights

Measuring Weight: A “Spring” Scale

Weight and Friction

Becoming Weightless

Seesaws, Weights, Distances, and Levers

Levers to Lift Weight

An Inclined Plane

Measuring Weight with a Balance

Can You Weigh Air?

Weighing Air

Some Effects of Air’s Weight

Defying Gravity

Defying Gravity Again

Using a Siphon to Defy Gravity

Forces Other Than Gravity

Words to Know

Further Reading

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Index

Fall 2003...

Sensational Science Experiments series. Happily unsensational, the books in this series present experiments that are generally simple, feasible, and interesting, such as estimating the height of skyscrapers. Materials are easily obtainable, and instructions are clear, augmented with relaxed illustrations and photos. More important, without fanfare Gardner encourages thinking about the experiments, supplying a few necessary answers at the end. Reading list, websites. Glos., ind.

July/August 2003...

Heavy-Duty Science Projects With Weight is a book of activities for upper elementary and middle school students. It includes a variety of hands-on activities that use everyday cheap materials to introduce students to many significant physics concepts related to gravity. The activities invite students to investigate important issues related to gravity and design experiments that go beyond the materials presented in the book. In this respect, the authors provide extensions to the activities that are useful for science fair projects. While challenging, the activities are accessible and interesting to all students, because they guide students to conduct the activities in a manner that maintains the excitement of investigating and discovering new concepts and relationships between concepts. Moreover, the language used in the volume is simple, accurate, and scientific. The book includes many useful features such as an emphasis on safety, guidelines for entering a science fair, tips for converting from English to metric units and vice versa, and links between science and the readers’ everyday life experiences. The volume can be used as a supplement to a school’s physical science curriculum, as a resource for science fair projects, or as an interesting resource for independent work by students.

Robert Gardner is an award-winning author of science books for young people. A retired high school teacher of physics, chemistry, and physical science, he enjoys writing, biking, and doing volunteer work.