Buoyant Force and Archimedes Principle



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Pre-Lab Questions

1. Draw a of a hanging mass before it is submerged in water. Make sure to label your forces.


2. Draw a free body diagram of a hanging mass after it is submerged in water. Make sure to label your forces. Which force is the force you measure with the spring scale?



3. Apply Newtons second law to your free body diagram in to solve for the magnitude of the buoyant force.


Experiment 1: Buoyant Force and Floating

Data Sheet

Table 1. Number of Washers a Clay Boat Can Hold Before Sinking

Type of Liquid Number of Washers
Plain Water
Salt Water


Post-Lab Questions

1. What did you observe when you placed the ball of clay into the beaker?


2.What were characteristics of the boat design that floated the best? Explain why this works, and the to float using Archimedes Principle.



3. How much water does an object have to displace before it will float?

4. If your .005 kg and is floating, what is the upward force the water is exerting on the boat?



5. How could you improve your boat design to increase the buoyant force without using more clay?


6. In the second part of the experiment, does the boat hold more weight in the regular water or the salt mixture? What does this say about the relative densities of salt water and plain water?



eScience Labs, 2018

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