Chapter 11 Forces in Fluids
What is pressure?
the force exerted over on a surface divided by the total area over which the force is exerted
What is the unit of pressure?
What is a material that can easily flow?
When elevation increases, atmospheric pressure...?
Water pressure increases when depth...?
How is atmospheric pressure measured?
How is density calculated?
Mass divided by volume
An upward force that acts on a submerged object is known as what?
Why does an object in water feel lighter?
the buoyant force acts in the direction opposite to gravity
What states that the buoyant force acting on a submerged object is equal to the weight of the volume of fluid displaced by the object?
When force is applied to a confined fluid, the change in pressure is transmitted to what parts of the fluid?
all; equal parts
What principle states that pressure increases by the same amount throughout an enclosed or confined fluid?
What uses liquids to transmit pressure and multiply force in a confined fluid?
What is an example of something that uses a hydraulic lift?
heavy construction equipment, car mechanic equipment, ladder on fire trucks, brakes on a car
What principle states that the faster a fluid moves, the less pressure it exerts?
A fluid flows from an area of high pressure to an area of what kind of pressure?
Give an example of something that is explained by Bernoulli's Principle.
how planes fly, how an atomizer works, why smoke rises up a chimney, how a flying disc glides through air
If you blow a stream of air between two balloons that are next to each other, the balloons...
move toward each other
Air above an airplane wing moves faster than the air below. What does this cause the plane to do?
increase its elevation
What are fluids made up of?
moving molecules that exert forces
A buoyant force always acts in what direction?
If an object sinks in a bucket of water, what can be said about the density of the object?
it is more than the density of water
A hydraulic system uses fluid to?
How does fluid pressure relate to the motion of a fluid?
the faster the fluid moves the less the pressure
A ship's ability to float in water is explained by what principle?