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How Do You Lift a Lion?: Machines (Wells of Knowledge) - Tapa blanda

Libro 3 de 13: Wells of Knowledge Science

Wells, Robert

 
9780807534212: How Do You Lift a Lion?: Machines (Wells of Knowledge)
Tapa blanda
ISBN 10: 0807534218 ISBN 13: 9780807534212
Editorial: Albert Whitman & Company, 1996

Sinopsis

How do you lift a lion? With a machine that's big and powerful with clanking metal parts? There are machines like that. But others have only a few moving parts. In fact, some machines are so simple that they don't seem like machines at all—like the wheel, the lever, and the pulley. These machines can make work easy—even if you're trying to lift a lion!

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Acerca del autor

Robert E. Wells is the author and illustrator of many award-winning science books for children, including Can You Count to a Googol? and Why Do Elephants Need the Sun?. He lives with his wife in Washington.

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How Do You Lift a Lion?

By Robert E. Wells

ALBERT WHITMAN & Company

Copyright © 1996 Robert E. Wells
All rights reserved.
ISBN: 978-0-8075-3421-2
CHAPTER 1

DID YOU EVER TRY TO LIFT A LION?

You'd have to be awfully strong.

It's because of the force of GRAVITY. Gravity pulls objects downward. When that object is as massive as a lion, it pulls pretty hard.

With a LEVER, you can lift a heavy weight with much less effort.

The main part of a lever is a bar or rod which balances, or pivots, on a FULCRUM.

If the FORCE side is longer than the LOAD side, you will have LEVERAGE. Leverage adds force to your own strength. With a force side this long, you could lift a lion!

So, if you had a lever with a handle THIS long, maybe you could lift them a little!

Gravity is pulling down on that panda. And there's also FRICTION between the ground and the pallet. Friction, or resistance, happens when two surfaces rub together. The more weight pushing on the surfaces, the more friction there is.


(Continues...)
Excerpted from How Do You Lift a Lion? by Robert E. Wells. Copyright © 1996 Robert E. Wells. Excerpted by permission of ALBERT WHITMAN & Company.
All rights reserved. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.
Excerpts are provided by Dial-A-Book Inc. solely for the personal use of visitors to this web site.

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Editorial
Albert Whitman & Company
Año de publicación
1996
Idioma
Inglés
ISBN 10 
0807534218
ISBN 13 
9780807534212
Encuadernación
Tapa blanda
Número de páginas
32
Contacto del fabricante
no disponible
Persona responsable
no disponible