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“Sink or Float” Activity Notes. Objective: Provide experience in formulating and testing hypotheses, classifying, and analyzing data.

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Sink or float activity notes

“Sink or Float” Activity Notes

Objective: Provide experience in formulating and testing hypotheses, classifying, and analyzing data.



  • THE SAME PRINCIPLE OF DENSITY COVERED IN THIS LESSON APPLIES TO OBJECTS OTHER THAN SODA – HUMANS AND SHIPS, FOR EXAMPLE. PEOPLE WHO ARE VERY MUSCULAR AND HAVE A LOW PERCENTAGE OF BODY FAT FIND IT VERY DIFFICULT TO FLOAT, WHILE PEOPLE WHO HAVE A HIGHER FAT RATIO FIND IT EASIER TO FLOAT. THIS IS BECAUSE MUSCLE TISSUE IS DENSER THAN WATER, AND FAT TISSUE IS LESS DENSE THAN WATER.




  • YOU CAN INCREASE THE ABILITY OF AN OBJECT TO FLOAT BY MAKING THE FLUID IT FLOATS IN DENSER. SALT WATER IS A GOOD EXAMPLE OF A DENSE FLUID. PEOPLE FIND IT EASIER TO FLOAT IN SALT WATER THAN IN FRESH WATER BECAUSE SALT WATER IS DENSER THAN FRESH WATER. SIMILARLY, SHIPS RISE WHEN THEY GO FROM FRESH WATER TO SALT WATER.


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