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9th Grade - Physical Science - Chapter 13 - Forces in Fluids
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9th Grade - Physical Science - Chapter 13 - Forces in Fluids Somerset Academy High 13.1 Fluid Pressure 13.2 Forces and Pressures in Fluids 13.3 Buoyancy
Terms in this set (30)
Pressure
Result of a force distributed over an area
How to calculate Pressure?
force/area
Pascal
SI unit of pressure. Measured in newtons/meters squared
Fluid
substance that assumes the shape of its container
Types of Fluids
Liquids and Gases
Water pressure increases
As depth increases
How's the pressure in a fluid at any given depth
it's constant, and exerted equally in all directions
factors that determine the pressure of a fluid that is not moving
depth, and the type of fluid
What is the pressure of the weight of Earth's atmosphere?
101kPa
Air pressure increases when
depth of the atmosphere increases
Air Pressure decreases when
The altitude increases
The pressure inside a body balances the air pressure outside resulting in,
Net-Force of 0 (balanced forces cancel)
Pascals's Principle
A change in pressure at any point in a fluid, is transmitted equally and unchanged in all directions throughout the fluid
Hydraulic System
A device that uses pressurized fluid acting on pistons of different sizes to change a force
How does a Hydraulic System work?
A constant fluid pressure is exerted on a larger area producing an increased output force
The bigger the input force
The bigger the output force, if the area is bigger
Bernouli Principle
The speed of fluid increases while the pressure of the fluid decreases
Lift
It is an upward force created by the difference between pressures
Buoyancy
The ability of a fluid to exert a upward force on an object placed in it
What causes Buoyancy?
The apparent loss of weight of an object in a fluid
Buoyant Force
It is the upward force that acts in the opposite direction of gravity
Archimedes Principle
The buoyant force on an object is equal to the weight of the fluid displaced by the object
Density
The ratio of an objects mass to its volume
The less dense an object is
The better it can float
The more dense an object is
The worse it can float
An object floats when
The buoyant force is equal to the weight of an object
An object sinks when
The buoyant force is less than the weight of an object
An object will be suspended when
The buoyant force is equal to the weight of an object
The greater the area of an object
The greater its buoyant force
The denser a liquid is
The greater the weight is displaced, which results in a greater buoyant force
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