How Do You Lift a Lion? (Wells of Knowledge Science Series). Questo articolo non è disponibile.
Lingua: inglese
Editore: Albert Whitman & Company, 1996
- Brossura
- Usato
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Codice articolo 00101158680
- Titolo
- How Do You Lift a Lion? (Wells of Knowledge Science Series)
- Autore
- Wells, Robert E.
- Editore
- Albert Whitman & Company
- Anno di pubblicazione
- 1996
- Condizione
- Acceptable
- Rilegatura
- Brossura
- Lingua
- inglese
- ISBN 10
- 0807534218
- ISBN 13
- 9780807534212
- Disegnatore
- Wells, Robert E.
- Serie
- Libro 3 di 13: Wells of Knowledge Science
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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Estratto. © Ristampato con autorizzazione. Tutti i diritti riservati.
How Do You Lift a Lion?
By Robert E. WellsALBERT WHITMAN & Company
All rights reserved.
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.
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