How Much Do You
Weigh Under Water?
DENSITY, BUOYANCY AND ARCHIMEDES' PRINCIPLE
Grades
WHAT'S COVERED? Formats:
4-6
Classroom Presentation
Why does a big ship float, but a small coin sink?
What is weight?
What is density?
Can a small object weigh more than a big object?
What is displacement?
Standards
Special Requirements:
SC-E-1.1.1
SC-E-1.1.2
SC-M-1.1.1
student under 100 lbs.
BACKGROUND
The relationship between math and science is clearly demonstrated in this popular activity.  In this workshop we'll apply Archimedes' Principle to determine the weight of an object under water - a student.

To apply Archimedes' Principle, we need to determine the weight of the object.  This is done by simply weighing the child.  Then we determine the weight of the water that would be displaced by the child's body by first determining the volume of the child's body.  These results can then be used to determine the child's weight under water.

When applying Archimedes' Principle, it is important to consider the weight and volume of not just the student's body, but also anything attached to the student's body.  The experiment is repeated with something attached to the volunteer's body - a swimming pool floatie.  How does the math change?
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