Lesson Summary
Students explore the concept of buoyancy using a clay ball. They alter the clay ball’s shape to make it float, rather than sink. The concept of conservation (changing the shape of the clay ball does not change the amount of clay or its weight) is introduced in this lesson. Students observe that the amount of clay is unchanged when they reshape it from a ball to a boat, pancake, or sausage. They also begin investigating the affect of different designs on an object’s buoyancy, when the weight is constant. Through the experiences in this lesson, students are able to formulate possible theories explaining how weight, size, and design affect buoyancy.
Teacher Background
The concept of conservation is when the clay’s shape has been changed; the weight or amount has not been changed. Developmentally, many students may not be able to understand this concept. Some students will change their thinking through this investigation. This lesson provides the experience that students need to build upon their understanding that floating and sinking involves more than weight.
Set-up/Management Tips
- Allow time for students to knead the clay to make it malleable for the investigation.
- If water has been saved in containers, it can be reused for this investigation.
- Set up multiple testing stations.
Literacy Support
Scientific Vocabulary
The following words are key vocabulary words that will be introduced in this lesson and reinforced throughout the unit:
|
|
