What do flagpoles and some window blinds have in common? They use pulleys to perform work! Pulleys are simple machines. They help us to do jobs more easily. But don't take our word for it. Put pulleys to the test with the fun experiments you'll find in this book. As part of the Searchlight Books collection, this series sheds light on a key science questionHow Do Simple Machines Work? Hands-on experiments, interesting photos, and useful diagrams will help you find the answer!
|Publisher:||Lerner Publishing Group|
|Series:||How Do Simple Machines Work? Series|
|Product dimensions:||7.10(w) x 9.00(h) x 0.30(d)|
|Lexile:||620L (what's this?)|
|Age Range:||8 - 11 Years|
About the Author
Roseann Feldmann earned her B.A. degree in biology, chemistry, and education at the College of St. Francis and her M.S. in education from Northern Illinois University. As an educator, she has been a classroom teacher, college instructor, curriculum author, and administrator. She currently serves as the principal at St. Peter School, an elementary school in Geneva, Illinois.
Most Helpful Customer Reviews
Every day you do work of some sort of another, even if you don't think it's work. For example, when you play cards you are actually working. If you work up a sweat trying to push on the side of a house and move it you are not. When a scientist defines work he or she means that "work is using a force to move an object" and that "force is a push or a pull." You can move cards, but unless you are Superman, you aren't going to move a house simply by pushing it. If you turn the pages of a book, no matter how easy it seems, you are actually working because if something moves "work has been done." There are two kinds of machines, simple and complicated, that we use to make our work easier. You'll learn the difference between the two kinds and once you do perhaps you can point out several different kinds of machines around you. You'll also learn about how gravity factors into the work formula. For example, it is much easier to lower something to the ground than lift it because gravity helps you. There are several experiments in this book that will show you how force works when you use different kinds of pulleys. In this book you'll also learn about measuring force, friction, different kinds of pulleys and their functions (fixed, moveable, and compound), and you'll learn many other interesting facts about how pulleys work. This is an excellent book for young students to learn a bout pulleys (simple machines). The most striking feature of this book are the detailed experiments that children can run to demonstrate what pulleys are and how they work. There are no complicated or expensive materials to purchase as most are readily available (spools, screwdriver, tape, straw, string, soda can, etc.). The only thing that may be necessary to purchase would be a spring scale to measure the amount of force needed to life a load. The necessary equipment needed for each experiment is listed in the text and shown in a visual display. Photographs clearly show how students are working through each pulley experiment. In the back of the book is an index, a glossary, and additional recommended book and website resources to explore. This book courtesy of the publisher.