Table of Contents Module 2 PROCEDURE


Part I: Sink or Float Classroom - 40 minutes


1. Access Prior Knowledge: Ask students, “Do sailboats float or sink?” Get several responses to engage students and explain their responses. The interesting fact is sometimes they sink and sometimes they float. Tell students, “Today we are going to investigate why some objects float and why some sink. When we go sailing what are some things that we think will float? And some things that may sink.”


2. Ask students to list things on a sailboat or a motor boat that may fall in the water while sailing (ring dings, sunglasses, hats, shoes, lifejackets, tools, whistles, sails, tiller extensions, rudders, motor, throw cushions fishing poles, etc).


3. Ask students to predict whether these objects will float or sink and why. Categorize the objects in the appropriate columns. This is an ideal time to tell students about the body of water they will be sailing on. Is it fresh or salt water? How deep is it? What is the required water depth for your sailing vessel vs. other vessels?


4. Ask students, “Why do sailboats float? Does it make a difference if they are in salt water or freshwater? Let’s investigate.”


5. Ask students, “What happens to the water level in a bath tub when you get in it?” (It rises). “Why?” (When an object is placed in water it takes up space, water is displaced forcing the water level to rise - Water Displacement.)


6. Demonstrate this with two glasses of water and an object that sinks.


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