Fluids
T/F: All fluids apply pressure
True
What is the equation for pressure?
Pressure= Force/Area
In what direction does bouyant force act?
Upward
What is pressure measured in?
Pascals
Pressure is equal throughout a closed container. What principle is this?
Pascal's Principle
What is a fluid?
Anything that can take the shape of the container.
T/F. The greater the surface area the greater the pressure.
False. The less the pressure.
What does Archimedes Principle state?
The amount of fluid an object displaces is equal to the bouyant force acting on that object
T/F: Pressure decreases as density increases.
False. It increases along with density.
Faster fluid exerts less pressure. What principle is this?
Bernoulli's Principle
Do fluids apply pressure in only one direction.
False. They apply pressure in all directions.
Where is pressure on Earth at it's absolute greatest?
Bottom of the ocean
No
More pressure is exerted by fast or slow fluid
Slow fluid
A force that opposes the motion of an object through a fluid refers to ______
Drag force
True
What is the pressure applied by a force of 235 N over an area of 13 cm2?
18.1 Pa
A 13 kg ball does not float if it displaces 6 kg of water. Explain why.
The amount it displaces is equal to the bouyant force acting on it.
Air Pressure decreases as (two correct answers):
a) Velocity increases
b) Elevation increases
c) Acceleration decreases
d) Gravity increases
A and B
Why do planes fly? Don't just state the principle.
Fluid under the wing generates more pressure since the fluid is slower moving.
What is the equation for density?
Density= Mass/Volume
What is the pressure applied by a force of 726 N over an area of 117 m2?
6.2 Pa
What happens to the bouyant force as an object travels deeper into water?
It increases
Explain why a roof blows off a house in a storm. Don't just state the principle.
Fast air above the home creates a low pressure zone. Slow air in the home creates a high pressure zone. The high pressure zone pushes up on the roof, and the low pressure zone does not push back with enough pressure.
Drag force increases as ______ increases.
speed of object, surface area, density of fluid