STC Floating and Sinking: Goals
In this unit, students investigate the phenomenon of buoyancy. From their experiences, they are introduced to the following concepts, skills, and attitudes.
- Several variables affect the buoyancy of an object.
- Water pushes up on both floating and submerged objects with a buoyant force; objects push down on the water.
- The buoyant force on large objects is greater than the buoyant force on smaller objects.
- The amount of water an object displaces is directly related to the object’s volume.
- Because of buoyant force, objects appear to weigh less when they are submerged.
- Objects that weigh more than the same volume of water sink; objects that weigh less than the same volume of water float.
- Salt water weighs more than an equal amount of fresh water.
- The buoyancy of an object varies with the density of the liquid.
- Observing, recording, and organizing test results.
- Applying previous experiences to make predictions.
- Creating and analyzing graphs.
- Calibrating a spring scale and using it to measure the magnitude of a force.
- Reading science materials for information.
- Communicating results through writing and discussion.
- Solving a problem that requires the application of previously learned concepts and skills.
- Developing an interest in investigating floating, sinking, and related phenomena.
- Recognizing the importance of repeating a test or measurement and comparing results.