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Terms in this set (31)
What two things does pressure depend on?
magnitude of the force (newtons) and surface area (square meters)
What does 1 Pascal (Pa) equal?
1 Newton per square meter
What does pressure refer to?
the force pushing on a surface
When does pressure exist?
whenever two objects are in contact with each other
Where do the points of pressure only occur?
the points of contact
What is fluid pressure?
a substance that can easily flow (liquids and gases)
Where do fluids exert pressure against?
the surface they touch
What is the weight of air at sea level?
What is air pressure?
the force exerted on you by the weight of tiny particles of air
How is pressure exerted in a nonmoving fluid?
in equal directions
Why aren't we crushed by pressure?
the fluids inside your body balance the fluids outside
What is the relationship between pressure and elevation?
air pressure decreases as elevation increases
What does air pressure at a given point result from?
the weight of air above that point
Is there more or less air at higher elevations?
therefore, less weight of air to support
What is the relationship between pressure and depth?
water pressure increases as depth increases
At greater depths, is there more or less water above that point?
therefore more weight of air to support
What does air in the atmosphere do to the water?
pushes down on it
How do you find total pressure?
the weight of the water plus the weight of the air above it
What is Pascal's Principle?
when force is applied to a confined fluid, an increase in pressure is transmitted equally to all parts of the fluid
What is a buoyant force?
a force exerted by water that acts on a submerged object
Where does the buoyant force act?
upward direction, against the force of gravity
*makes a object feel lighter
Where does a fluid exert pressure?
on all surfaces of a submerged object
Since the pressure in a fluid increases with depth, the upward pressure on the bottom of the object is __________ than the downward pressure on top.
How do you calculate buoyant force?
weight in air - weight in water
What is Archimedes' Principle?
the buoyant force on an object is equal to the weight of the fluid displaced by the object
If the weight of an object is greater than the weight of the displaced fluid...
the object will sink
If the weight of the object is equal to the weight of the displaced fluid...
the object will float
The greater the volume of water displaced...
the larger the buoyant force
Objects float as long as the buoyant force is __________ than its weight.
What is Bernoulli's Principle?
pressure exerted by a moving stream of fluid is less than the pressure of the surrounding fluid
What is pressure measured in?
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