Buoyant Force
Materials:
Procedures:
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Place the 2-liter bottle and the Styrofoam bowl inside the sink next to each other. Aim the tube that is sticking out of the 2-liter bottle into the Styrofoam bowl so the Styrofoam bowl can catch the overflowing water.
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Fill the 2-liter bottle with water until the water starts to flow through the plastic tubing. When the water stops flowing through the tube then you have reached a proper water level to perform the experiments. This water level must be reached before beginning each trial.
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Make sure ALL the water is emptied out of the Styrofoam bowl before starting each trial.
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Find the weight of the container with sand using the scale.
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Carefully slide the container with sand into the 2-liter bottle. The water should displace (move up).
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Water should flow through the tube and into the Styrofoam bowl. Once the water stops flowing through the tube, take the Styrofoam bowl and place it on the scale. This is your buoyant force. Record in the data table.
- Empty the Styrofoam bowl and repeat steps 1 – 6 for all of the objects.
Note: For objects that float, you will need to push down on the object so that it is completely submerged. You also need to make sure whatever you use to push down the object does not touch the water.
Results/Data Table:
Object
|
Sink or Float?
|
Weight of Object (g)
|
Buoyant Force (g)
|
| Container with Sand |
sink |
139.95 |
97.25 |
| Rubber Ball |
sink |
143.27 |
128.39 |
| Container with Pennies |
sink |
133.51 |
71.42 |
| Empty Container |
Float |
13.52 |
60.42 |
| Block of Wood |
float |
81.52 |
134.34 |
| Empty Water Bottle |
float |
15.04 |
269.6 |
Data Analysis:
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Look at the data table and look at the objects that sunk. Compare each object's weight to its buoyant force. What do you notice? Use evidence (numbers from data table).
What we noticed about the objects that sunk is that they weight more, like the container with sand weights 139.95 g and the Buoyant Force is 97.25 g.
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Look at the data table and look at all the objects that floated. Compare each object's weight to its buoyant force. What do you notice? Use evidence (numbers from data table).
What we noticed about the objects that floated is that their buoyancy force was more than their weight. For example, for the empty container it's weight is 13.52 and the Buoyant force is 60.42.
3. Make a force arrow diagram for each object. Your force arrow diagram should include:
- Arrows - correct length and direction
- All things are labeled
- Calculate the net force
Container with Pennies
|
Rubber Ball
|
 |
 |
Container with Sand
|
Empty Container |
 |
 |
Block of Wood
|
Empty Water Bottle
|
 |
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Summary: Your summary should include:
- A description of what you did in this experiment.
- Answer the experiment question, which is stated at the top.
- Be at least 4 to 5 sentences (about 100 words)
Tania Benitez
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Taylor Andersen
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During this lab, we experimented more with Buoyant Force, we measured it by letting the water fall into a bowl which we measured. We used different objects to measure, such as: a container with sand, an empty container, rubber ball, a container with pennies, a block of wood, and an empty water bottle, By looking at the table I noticed that out of six of the objects, three floated and the other three sunk. The weight of an object affects the buoyancy force because if it has a lot of weight, it will sink and if the buoyancy force is more than the weight then it will float.
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In this lab we worked on buoyant force we put a few objects in the thing we used to get our measurements. it was a soda bottle with the top cut off, hole drilled in it, and a tube in it for the water to drain. we used a plastic bowl to catch the water then we measured it and that is how we got the answer. after we got all of our data we drew pictures of it to show if it sank or float. for an object to float it needs to have an air pocket, if that air pocket is messed up or not there the object will sink or go to the middle. for example a rubber ball with a solid core all the way threw would sink but a water bottle with no water in it would float because it has an air pocket.
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edwin
hernandez
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Wyatt Holtkamp
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in this experiment we used a form of water displacement to find out the buoyancy force of each object. the buoyancy force is measured by using a form of water displacement, with a cut in half soda bottle, a small hose, and a paper cup. basically if you drop an object in the water and it ways more than the force of the buoyancy then the object will sink. but if the buoyancy force is stronger then the object will float not sink.
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