Sit still, Pressure!
The Force exerted per area given on a fluid
What is pressure?
What happens to pressure as depth increases?
Pressure increases.
Why are dams thicker at the bottom?
Because pressure is greater at deeper levels.
Smooth, orderly flow in layers.
What is laminar flow?
The speed of fluid particles.
What is velocity?
The direction fluid pressure acts on container walls.
What is perpendicular to the surface?
The three factors affecting hydrostatic pressure.
What are density, gravity, and depth?
A device that measures atmospheric pressure using fluid height.
What is a barometer?
Chaotic flow with swirls and mixing.
What is turbulent flow?
When pipe area decreases, velocity tends to _____.
Increase.
Two identical holes are made at the same depth on opposite sides of a tank.
The water shoots out the same distance.
What happens to the water flow from both holes?
Two swimmers are at different depths in a pool.
Who experiences greater pressure?
what is the deeper swimmer experiences more pressure.
If the height of a fluid column increases, pressure will _____.
Increase.
Which flow type wastes more energy?
Turbulent flow.
Honey flows slower than water because it has higher _____.
Viscosity.
A brick sinks in water but floats in mercury.
Mercury exerts greater upward pressure due to higher density.
Why does the brick float in mercury but not in water?
Why is it harder to open a submarine hatch deep underwater?
Because external water pressure increases with depth.
Why do water tanks sometimes burst at the bottom first?
Because pressure is greatest at the bottom.
Why is blood flow in healthy arteries usually laminar?
Because it is smoother and more efficient at normal speeds.
Which fluid is more likely to have turbulent flow: water or honey?
Water (because it has lower viscosity).
A diver feels pressure on all sides underwater.
what is pressure in a fluid at rest acts equally in all directions
Water is replaced with oil in a tank at the same height.
What happens to the pressure at the bottom?
Pressure decreases because oil is less dense than water.
Why can tall water towers supply water without pumps?
Because gravity creates pressure due to height difference.
Increasing fluid speed too much will likely change _____ into _____.
Laminar to Turbulent flow.
Name three factors that affect fluid motion.
Velocity, cross-sectional area, and viscosity.