________________ CM . . . . Volume XXI Number 7. . . .October 17, 2014

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Pressing Down: The Lever. (The Robotx Get Help from Simple Machines).

Gerry Bailey. Illustrated by Mike Spoor.
St. Catharines, ON: Crabtree, 2014.
32 pp., pbk., hc., pdf & html, $10.95 (pbk.), $21.56 (RLB.).
ISBN 978-0-7787-0422-5 (pbk.), ISBN 978-0-7787-0416-4 (RLB.), ISBN 978-1-4271-7534-2 (pdf), ISBN 978-1-4271-7528-1 (html).

Subject Headings:
Levers-Juvenile literature.
Simple machines-Juvenile literature.

Grades 1-3 / Ages 6-8.

Review by Barbara McMillan.

*** /4

   
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Pulling Up: The Pulley. (The Robotx Get Help from Simple Machines).

Gerry Bailey. Illustrated by Mike Spoor.
St. Catharines, ON: Crabtree, 2014.
32 pp., pbk., hc., pdf & html, $10.95 (pbk.), $21.56 (RLB.).
ISBN 978-0-7787-0423-2 (pbk.), ISBN 978-0-7787-0417-1 (RLB.), ISBN 978-1-4271-7535-9 (pdf), ISBN 978-1-4271-7529-8 (html).

Subject Headings:
Pulleys-Juvenile literature.
Simple machines-Juvenile literature.

Grades 1-3 / Ages 6-8.

Review by Barbara McMillan.

*** /4

   
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Rolling Along: The Wheel and Axle. (The Robotx Get Help from Simple Machines).

Gerry Bailey. Illustrated by Mike Spoor.
St. Catharines, ON: Crabtree, 2014.
32 pp., pbk., hc., pdf & html, $10.95 (pbk.), $21.56 (RLB.).
ISBN 978-0-7787-0424-9 (pbk.), ISBN 978-0-7787-0420-1 (RLB.), ISBN 978-1-4271-7536-6 (pdf), ISBN 978-1-4271-7530-4 (html).

Subject Headings:
Wheels-Juvenile literature.
Axles-Juvenile literature.
Simple machines-Juvenile literature.

Grades 1-3 / Ages 6-8.

Review by Barbara McMillan.

*** /4

   
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Sloping Up and Down: The Inclined Plane. (The Robotx Get Help from Simple Machines).

Felicia Law & Gerry Bailey. Illustrated by Mike Spoor.
St. Catharines, ON: Crabtree, 2014.
32 pp., pbk., hc., pdf & html, $10.95 (pbk.), $21.56 (RLB.).
ISBN 978-0-7787-0425-6 (pbk.), ISBN 978-0-7787-0419-5 (RLB.), ISBN 978-1-4271-7537-3 (pdf), ISBN 978-1-4271-7531-1 (html).

Subject Headings:
Inclined planes-Juvenile literature.
Simple machines-Juvenile literature.

Grades 1-3 / Ages 6-8.

Review by Barbara McMillan

*** / 4

   
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Splitting Apart: The Wedge. (The Robotx Get Help from Simple Machines).

Gerry Bailey. Illustrated by Mike Spoor.
St. Catharines, ON: Crabtree, 2014.
32 pp., pbk., hc., pdf & html, $10.95 (pbk.), $21.56 (RLB.).
ISBN 978-0-7787-0426-3 (pbk.), ISBN 978-0-7787-0420-1 (RLB.), ISBN 978-1-4271-7538-0 (pdf), ISBN 978-1-4271-7532-8 (html).

Subject Headings:
Wedges-Juvenile literature.
Simple machines-Juvenile literature.

Grades 1-3 / Ages 6-8.

Review by Barbara McMillan.

*** /4

   
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Winding Around: The Screw. (The Robotx Get Help from Simple Machines).

Gerry Bailey. Illustrated by Mike Spoor.
St. Catharines, ON: Crabtree, 2014.
32 pp., pbk., hc., pdf & html, $10.95 (pbk.), $21.56 (RLB.).
ISBN 978-0-7787-0427-0 (pbk.), ISBN 978-0-7787-0421-8 (RLB.), ISBN 978-1-4271-7539-7 (pdf), ISBN 978-1-4271-7533-5 (html).

Subject Heading:
Screws-Juvenile literature.

Grades 1-3 / Ages 6-8.

Review by Barbara McMillan.

*** /4

   
   

excerpt:

A machine is a tool used to make work easier. Work is the effort needed to create a force. A force is a push or pull on an object. Machines allow us to push, pull or lift a heavy weight much easier, or using less effort. All machines are made up of a least one simple machine. (p. 5)

Your arm is a lever. The effort is the muscle in your arm, the fulcrum is your elbow, and your hand holds the load. (From Pressing Down, p. 20.)

A single pulley is a wheel with a groove in its rim. A rope or metal cable passes through the groove. More than one pulley is called a block and tackle. The pulleys are the blocks, and the rope or cable is the tackle. The more pulleys you have in the block and tackle the less effort you will need to lift something. (From Pulling Up, pp. 14-15.)

It’s RobbEE’s job to carry all of the parts into the workshop. So much stuff! Phew! It’s hard work. He gets so tired he has to stop a lot to recharge his battery for energy. “Hurry.” Says RobbO, who can’t wait to get started on his new invention. RobbEE tires carrying several boxes at a time, but they’re too heavy. He tries dragging them and pushing them, but gets just as run down. “RobbEE, you can make things a lot easier if you use the wheels,” says RobbO.” Of course!” says RobbEE who had forgotten all about the wheels. “I’ll use wheels!” (From Rolling Along, pp. 6-9.)

“At least we had to climb the hill once,” says RobbO. He tells his friend the story of Sisyphus. …he was forced by the gods to roll a heavy stone up a steep hill. Every time he got to the top, the stone rolled back to the bottom, and Sisyphus had to start again. He had to go on and on doing that forever. (From Sloping Up and Down, pp. 14-15.)

RobbO and RobbEE are digging into a pizza. RobbO divides it using a special pizza cutter. “It’s a super gadget, “ he says. “It’s a double wedge, but it’s also a wheel and axle. So it’s two simple machines working together.” (From Splitting Apart, p. 26.)

You have to turn a screw a longer distance than it would take a bang a nail straight down. But you use less effort. The effort is spread over a longer distance making it easier. This is the same way that sliding something up a longer ramp is easier than lifting it straight up. (From Winding Around, p. 29.)

 

Author Gerry Bailey uses the experiences of two fictional robots, RobbO and RobbEE, to introduce readers to the inclined plane, wedge, screw, lever, pulley and the wheel and axle system in Crabtree’s six volume series “The Robotx Get Help from Simple Machines”. Each book in the series begins with RobbO and RobbEE who are generally found trouble-shooting in a workshop filled with tools, acetylene tanks, and Rube-Goldberg like machines. Whether they’re attempting to put together pieces from an Meccano-like “Erector” set, deciding how to move into the workshop all of the parts they’ve collected to build a “whizz-fizz machine”, or lifting the engine out of a very old car, they find a way to make their work easier by using one of the six simple machines. Not surprisingly, it is often the slightly larger and perhaps older RobbO who helps his smaller friend.

     Bailey’s decision to use two robots and Mike Spoor’s wonderful illustrations of RobbO and RobbEE take the emphasis off the physics (load force, effort or applied force, friction, and mechanical advantage) to focus more on the kinds of information such science books for young children should include: the use of a particular simple machine for a specific task and the identification of other tools that are commonly used to do something similar. As one example, in Splitting Apart: The Wedge, RobbO suggests that they attach two wedges to the front of their tractor to make a V-shaped plow for moving snow. Readers are then helped to know the difference between a single wedge and a double wedge before reading about RobbO and RobbEE using axes to split logs, a chisel to cut wood, and a knife to slice bread. Among other examples, Baily also informs his readers that their finger nails and front teeth are wedges as are the beaks and claws of birds and the teeth of zippers and saws.

      Near the middle of each book, one of the robots, usually RobbO, tells a story that links the knowledge of simple machines to history and literature. Three of these stories involve Archimedes and one of his inventions that incorporates a lever, screw, or pulley system. Two stories are focused on the Greek myths of Sisyphus (see the fifth excerpt above) and the goddess Athena who turned Arachne into a spider because she bragged about the quality of her spinning.

     The story told by RobbEE uses mischievous monkeys and a wedge in a log to relate the moral teaching “It’s not wise to poke your nose into other people’s business.” These are wonderful interludes because they are interdisciplinary and help children to think about the origin of simple machines many hundreds of years ago and their continued use today. As such, it’s unfortunate that the story of Archimedes and his compound pulley suggests that he “bragged that he could move the entire world.” One infers that he would use a pulley to do so. In actuality, it was a lever whose working he had mathematically explained. He is known to have said, “Give me a firm spot on which to stand, and I shall move the earth.” In the context of his deep understanding, I’m not convinced this is an example of bragging. It’s a comment on the lever as a simple machine in the hands of a human being.

      Like other Crabtree series, “The Robotx Get Help from Simple Machines” includes a table of contents, glossary of terms, index, and a list of at least three books and three websites that readers can access for additional information. Editor of the series, Kathy Middleton, has also inserted stock photographs on pages where simple and compound simple machines are presented. Although not unusual in Crabtree books, I found it odd to see Spoor’s colourful cartoon-like drawings of RobbO or RobbEE superimposed on a photograph of a drill used in building tunnels and on a stock photograph of the pyramids of Giza that were constructed using ramps.

      Unique to this series is a two-page spread near the end of each book titled “RobbO’s science workshop” where RobbO explains the simple machine the book is focused upon “to his friends”. These explanations are elementary scientific explanations that may not make sense to all six to eight-year-old readers. To understand what Bailey has written, children need to have opportunities to play with inclined planes, wedges, screws, levers, pulleys and wheel and axle systems and to become aware of the effort force needed to move or lift an object and how a simple machine can change this as well the direction of a push or pull, and the tradeoff between applied (input) force and the distance an object moves (see final excerpt above).

Recommended.

Barbara McMillan is a teacher educator and a professor of science education in the Faculty of Education, the University of Manitoba.

To comment on this title or this review, send mail to cm@umanitoba.ca.

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