Fluids & Pressure
Why does water exert more pressure than air?
it is more dense
Where did Archimedes discover buoyant force?
In the bathtub
Sink or Float: Weight 100 N Buoyant Force 100 N
Float
What country was Bernoulli from?
Switzerland
This force is responsible for pulling the plane towards earth.
Gravity
If air flows from point B to point C, point B must be an area of what?
High Pressure
How do you determine the volume of an irregularly shaped object?
Water Displacement
An object will float as long as it’s density is _____ _____ the fluid its in.
Less Than
Fast moving air exerts ____ ____.
Low Pressure
When would it be important to increase an airplane’s drag?
Landing
Where do fluids exert pressure?
On all its surfaces
In water, you would displace an amount of liquid equal to what?
Your Volume
Adding salt to water increases it’s _____ without increasing volume, therefore, _______ it’s density.
Mass, Increasing
Explain why the strip of paper was lifted when we blew air across it.
Fast air, low pressure
____ air flows over the top of a wing creating an area of ____ pressure.
Fast, low
Who is experiencing more atmospheric pressure right now, you on the third floor, or students in the music room?
Students in the music room
What does it mean when an object has negative buoyancy?
It is sinking
Air that is moving slowly will have what kind of pressure
high
Why is thrust important to flight?
It makes air flow over the wing.
Wind rushes towards the center of a hurricane. The center must be an area of?
Very low pressure
Buoyant force is equal to what?
Weight of the fluid displaced
increases
Explain why the two ballons moved towards each other when the air was blown between them.
Fast air, low pressure
Explain when air must move faster over the top of a wing.
Longer distance and nature does not like vacuums.