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Start with the force diagram for the fully submerged object when the force from above is capable of keeping the object at rest in the fluid without touching the bottom of the container. Question: Discuss qualitatively how the buoyant force should change if we use a larger object using the expression for buoyant force above. In experiment 1, we will have a direct measurement of the force needed to keep the mass at rest in the water. Using your free-body diagram, explain how you could use this to calculate the buoyant force on the object. You can assume you have access to a scale to measure the mass of the object. Since the objects in this experiment will be fully submerged, the volume of liquid displaced is equal to the volume of the object itself. In the experiment, you will measure the volume and buoyant force on many objects with different volumes. Predict in as much detail as you can what a graph of the Buoyant force versus the volume of the object should look like according to the law above. (This will form the basis of your analysis) In experiment 2, we will place a single object in multiple fluids where it can float. Since it can float on its own there will be no additional force holding it up as in experiment 1. Draw a free body diagram for the floating object. Use your free body diagram to relate the magnitude of the buoyant force to the other force(s) on the object. What does the expression for the buoyant force predict if you put it in a more dense liquid where it can still float? A less dense one? Think about what happens to the magnitude of the buoyant force as you change the liquid if you use the same object.

Start with the force diagram for the fully submerged object when the force from above is capable of keeping the object at rest in the fluid without touching the bottom of the container.

Question: Discuss qualitatively how the buoyant force should change if we use a larger object using the expression for buoyant force above.

In experiment 1, we will have a direct measurement of the force needed to keep the mass at rest in the water. Using your free-body diagram, explain how you could use this to calculate the buoyant force on the object. You can assume you have access to a scale to measure the mass of the object.

Since the objects in this experiment will be fully submerged, the volume of liquid displaced is equal to the volume of the object itself. In the experiment, you will measure the volume and buoyant force on many objects with different volumes.

Predict in as much detail as you can what a graph of the Buoyant force versus the volume of the object should look like according to the law above. (This will form the basis of your analysis)

In experiment 2, we will place a single object in multiple fluids where it can float. Since it can float on its own there will be no additional force holding it up as in experiment 1.

Draw a free body diagram for the floating object. Use your free body diagram to relate the magnitude of the buoyant force to the other force(s) on the object.

What does the expression for the buoyant force predict if you put it in a more dense liquid where it can still float? A less dense one? Think about what happens to the magnitude of the buoyant force as you change the liquid if you use the same object.

Added by Ann C.

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