Floating and Sinking Author:Peg Marson, Ron Marson Baby oil floats on rubbing alcohol, which floats on corn oil, which floats on water. Why do they float in that order? A candle sinks through these layers until it floats on corn oil. Why won t it sink further? Your students will discover the physics behind these phenomena by measuring mass, displacing volumes and calculating densities. They ll m... more »easure weight and buoyancy on spring balances they build themselves. In time they ll experience, like Archimedes, that flash of understanding: Eureka! Floaters float and sinkers sink because they both are buoyed up by a force equal to the weight of the water they displace. The book is organized into three main parts: INTRODUCTION * A TOPS Model for Effective Science Teaching * Getting Ready * Gathering Materials * Sequencing Task Cards * Long Range Objectives * Review / Test Questions TEACHING NOTES (24 lessons) * Density of Water * Density of Other Liquids * Liquid Pairs * Predicting Layers * Dunk the Candle * Specific Gravity * Float the Candle * How Now, Brown Dowel * The Natural Order * Overflow Cup * Density Math * Clay Boat * Neither Here Nor There * Three Clay Bodies * Spring Scale * Fresh Water Weigh-Ins * Salt Water Weigh-Ins * Archimedes Principle * Hydrometer (1) * Hydrometer (2) * Thin Blue Line * Melting and Freezing * Fire and Water * Floating in Air REPRODUCIBLE LINE MASTERS* 24 Open-Ended Task Cards * Weight Scale * Hydrometer ScalesAuthor: Ron Marson, Illustrated by Peg MarsonSubject Area: PhysicsLevel: Grades 7-12Format: 64 pages, PaperbackPublisher: TOPS Learning Systems (1995)ISBN: 0-941008-79-7« less