science bouyancy test Flashcards
Where is the origin of the word buoyant? Like where is it from and what is the Spanish word?
Boyar means to float.
What does buoyant mean?
To float
- buoyant force
An upward force applied by a fluid on an object in the fluid.
Why can you lift someone in water who you could not lift when you are both out of water?
It is because of buoyant force. And your muscles.
What do they mean when they say “acts on any object in a liquid”? Explain what the word act means.
The force is applied on to the object in a liquid.
Question: When they say acts on “any object”, give two places in the water column that the buoyant force acts and give examples of each.
Floating objects
Rafts
Ships
Submerged objects
Such as rocks as the bottom of the lake.
What keeps a helium balloon floating in the air?
Buoyant force In the air is stronger than the gravitational force.
If a buoyant force keeps a helium balloon in the air, what does this indicate?
Gravitational force is pulling downward.
Why do you think helium balloons begin to sink after a few days?
The gas starts to run out. And shrink after days.
In what direction does fluid apply pressure to the sides of an object within it? Think about what you know from Lesson 1.
All perpendicular sides
With what you know from question 1 in this section, the forces from water pressure on divers are in what two directions?
Horizontal forces on each side is equal. And vertical
Which forces on the sides of a diver under water are equal?
Horizontal
Which forces on the sides of a diver under water are NOT equal?
vertical
Why are the forces that are not equal…not equal?
One diver is deeper than the other.
What is the difference between the upward force from pressure and the downward force from pressure on a diver that is under the water?
Pressure is greater on the bottom.
Why is the buoyant force on an object always in an upward direction?
The pressure is always greater at the objects bottom.
How is pressure related to the buoyant force?
The object that is deeper has more pressure,
What does the term “displacement of water” mean
The amount of fluid displaced is directly related to its volume.
- Archimedes’ principle -
Principle that states that The buoyant force on the object is equal to the weight it displaces.
What is the buoyant force on you if you displace 400 N of water as you dive under the water?
400 n
Explain why the boat on the right sinks in regards to the buoyant force
It weighs more than the water.
an object weighing 14 N experiences a 12 N buoyant force, will it sink or float?
Sink
Why does a helium balloon rise?
The helium is less dense than the oxygen and nitrogen in the air.
After a few days, why does a helium balloon fall back down to the ground?
After a few days, why does a helium balloon fall back down to the ground?
