Pressure & Density
What happens to the pressure in a fluid as you go deeper in the fluid?
It increases
In which direction does buoyant force act?
upwards
This principle deals with pressure on fluids in an enclosed space.
Pascal's principle
What is the buoyant force on a floating object that weighs 2,000 N?
2,000 N
What two states of matter are both fluids?
liquids and gases
Where would the atmospheric pressure be greatest, at the top of a mountain or at sea level?
Whose principle deals with buoyant force?
Archimedes'
This principle deals with the pressure of moving fluids.
Bernoulli's principle
In a hydraulic system, piston B is 5 times bigger than piston A.
What is the output force from piston B if 5 N of force are put on piston A?
25 N
If an object sinks in a fluid, the buoyant force is ____________ the weight of the object.
less than
Fluids put pressure on an object _________ in all directions.
equally
If the buoyant force is equal to _______________, the object will float.
the weight of the object OR weight of the displaced fluid
According to Bernoulli, when the speed of particles increases, the pressure ___________.
decreases
What is the density of 10 ml of fluid that weighs 5 grams? Include proper unit!
0.5 g/ml
Of the three scientists, Pascal, Archimedes, and Bernoulli, which one lived the longest time ago?
Archimedes
As you increase the surface area on which a force is applied, you ____________ the pressure.
Decrease
Buoyant force is caused by the _______________ of the fluid displaced.
weight
A fluid hydraulic system uses an enclosed fluid system to increase _____________.
force or output force
What is the pressure on a 5 m2 surface that has just been hit with 25 N of force? Include proper metric unit!
5 Pa
According to Pascal, pressure is transmitted equally throughout a fluid in a _______________ container.
closed
Why do some fluids exert more pressure than others, such as water?
density
Why would the buoyant force increase when you push a floating object under water?
Because the volume(-->weight) of water displaced increases
Give an example of Bernoulli's principle we experienced in class.
floating ball
airplanes
toilet paper
(not trash bag or vacuum chamber)
What three variables are included in the formula that explains fluids in a closed container (Pascal's principle)?
force, area, pressure
How are airplane wings shaped (in cross-section)? What does this do and what does it cause?
They are curved on the top to increase distance over which the air must travel. This increases the velocity of the air and causes lower pressure on the top and higher pressure on the bottom. This causes lift!