Concepts of Floating and Sinking
Teachers want to keep these ideas in mind throughout the unit to help guide instruction and to emphasize with learners.
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.
Inquiry Skills
Inquiry skills are those skills students use to make sense of their science investigations. They tell what the students will actually be doing in science. The Inquiry Skills for Floating and Sinking are:
Observe
Record
Predict
Organize
Analyze
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Create Graphs
Measure/ Weigh
Communicate
Ask Questions
Read for Information
Calibrate a Spring Scale
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