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Buoyancy vs Mass and Volume

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by

Ruby Colwell

on 26 November 2013

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Transcript of Buoyancy vs Mass and Volume

Buoyancy vs Mass and Volume
Hypothesis:
As a group we hypothesized that as the volume increases, the more the buoyant force increases. And as the liters increase (the amount of water displaced) the buoyancy increases.
How we collected
our data
Procedure:
1. First, choose your first material to test. (aluminum)
2. Change the mass to 5 kilograms
3. Put the first material (aluminum) on the scale in the air.
4. Then, measure and record the amount of Newtons the material took. (force of the object, gravity force)
5. After you have recorded the amount of force in the air, put the material on the scale underwater. If the material floats then the buoyancy force is equal to the gravity (and the force of the object). Which was measure earlier. If the material sinks, measure the amount of Newtons the scale underwater recorded. Then subtract the amount of Newtons recorded underwater from the mount of Newtons recorded in the air. This is the buoyant force of the material that has sunken.
6. Repeat these steps for all of the other materials.

What Does the Data Tell Us?
Our data shows us that as volume increases, the buoyant force does NOT increase. However, when the amount of water displaced increases, the buoyant force does increase. Our conclusion is that the volume and the mass does NOT affect the buoyant force but the amount of water displaced (and the size) does affect the buoyant force.
SO WHAT!?
Our data!
Our Boat!

Knowing that the size of an object increases the buoyant force, we can prove that the bigger an object is, the harder it will be to put it underwater. We know that if we want an object to not sink (like our tinfoil boats in our past experiment), it needs to be bigger (but not necessarily heavier since the volume does not affect the buoyancy).
Our boat could hold a large amount of pennies because it was very light but still took up lots of space (volume)
Why our boat worked
Full transcript