Things That Float and Things That Don't

Overview

It can be surprising which objects float and which don't. An apple floats, but a ball of aluminum foil does not. If that same ball of foil is shaped into a boat, it floats! Why? And how is it possible that a huge ship made of steel can float? Answering these questions about density and flotation is David A. Adler's clear, concise text, paired with Anna Raff's delightful illustrations. Activities that demonstrate the properties of flotation are included.

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Overview

It can be surprising which objects float and which don't. An apple floats, but a ball of aluminum foil does not. If that same ball of foil is shaped into a boat, it floats! Why? And how is it possible that a huge ship made of steel can float? Answering these questions about density and flotation is David A. Adler's clear, concise text, paired with Anna Raff's delightful illustrations. Activities that demonstrate the properties of flotation are included.

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Editorial Reviews

Publishers Weekly
Adler shows his customary skill for explicating mathematical concepts in this smart exploration of floatation and density. Several experiments allow for a hands-on approach: Adler suggests filling a sink with water and testing whether different objects float, as well as using modeling clay to demonstrate how shape is as important a factor as density. Raff’s pastel palette and cheerful characters keep the mood light and pair well with Adler’s explanations, which are clear without being dauntingly technical. Along with Lynne Berry and Matthew Cordell’s What Floats in a Moat? (reviewed Apr. 29), readers will be well-prepared when it comes to displacement and density this fall. Ages 4–7. Author’s agent: Jodi Reamer, Writers House. (Sept.)
School Library Journal
K-Gr 2—This introduction to density offers new vocabulary in bold font, delightful soft-hued illustrations, and clearly focused content on flotation. The strong examples provide extension activities that can be done at home or in the classroom. The images enhance the concept as readers meet a boy, a girl, and their dog as they embark on an adventure to discover what will float and what won't. For example, a spread depicting how density is relative to the size of the object shows the dog looking over a kitchen sink full of water as a piece of aluminum foil floats as a loose ball and sinks as a tight one. This title supports the Common Core State Standards that focus on measurement skills, interpretation of data, and incorporation of key ideas and details in the text. Recommended for math collections in public and school libraries and classroom shelves.—Melissa Smith, Royal Oak Public Library, MI
Kirkus Reviews
A boy, a girl and a dog demonstrate that things float in water when they are less dense than the water around them. Adler, who has demystified math for young readers for years in titles ranging from Roman Numerals (1977) to Millions, Billions, and Trillions (2013) turns his attention to physics with this simple but effective explanation of principles of flotation and density. His clear, logical text invites readers to experiment with different objects, to shape boats, and to make both ice and salt water mixtures. Raff's illustrations take this invitation further, showing a pair of children using toy boats, plastic bottles, pennies, aluminum foil, clay and ice to discover what things float and why. These digitally combined ink washes and drawings add interest and some humor, supporting and enriching the text, except on one page. There, a line showing the water level of a bottle to which salt has been added seems to show that the water level has risen though the author makes clear that the level should not change. Curiously, the series of experiments stops at that point rather than continuing with the denser salt water, as good teachers would encourage children to do. This appealing introduction can serve as a springboard for further investigations. (Informational picture book. 5-8)
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Product Details

  • ISBN-13: 9780823428625
  • Publisher: Holiday House, Inc.
  • Publication date: 8/28/2013
  • Pages: 32
  • Sales rank: 251,804
  • Age range: 7 - 10 Years
  • Product dimensions: 9.00 (w) x 10.90 (h) x 0.40 (d)

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