13 Science Flashcards
What is the SI unit of pressure?
Pascal(Pa)
What is the pressure equation?
Pressure=force/area
P=f/a
What is the concept of fluid pressure?
Water pressure increases as depth increases. The pressure in a fluid at any given depth is constant, and exerted equally in all directions
What are two types of fluid?
Liquids and gases
What affects the pressure of a fluid?
Type of fluid and depth
Describe atmospheric pressure.
Air pressure decreases with depth off the atmosphere. So air pressure decreases as altitude increases.
What is pascal’s principle?
A change in pressure at any point in a fluid is transmitted equally and unchanged in all directions throughout the fluid.
What is a hydraulic system and what does it help with?
A device that uses pressurized fluid acting on pistons in different sizes to change force. It helps with force.
What happens in a hydraulic lift system?
An increased output force is produced because a constant fluid pressure is exerted on the larger area of the output piston.
What is Bernoulli’s principle?
As speed of a fluid increases the pressure within the fluid decreases.
What is lift?
The pressure difference between the top and the bottom of the wing creating an upward force.
What is a buoyant force?
The upward force acting on an object in a fluid.
Why do hot air balloons float?
They use hot air in the ballon which ways les than normal temperature air so it floats because it’s less dense.
What is Archimedes’ principle?
The buoyant force on an object is equal to the weight of the fluid displaced by the object.
How do particles of a liquid exert pressure on a container?
When you put pressure on a bottle the pressure is increased at depth and other pressure is moved and put equally on all other points of the bottle.
