Pressure In Fluids Flashcards
What is pressure and what does it determine?
Pressure is force per unit area. Determines the effect of a force on a surface
How do flat shoes exert pressure?
They spread force over a large area, reducing pressure
How do snow shoes exert pressure?
They have a very large area to exert force over, to reduce pressure on snow to avoid falling through
How do high heels exert pressure
They transfer force through a much smaller area, causing much greater pressure
What happens if force acts on a small area?
Pressure increases
What is the unit of pressure?
Pascals (Pa)
What are liquids?
Gases and fluids
What happens to pressure as you go deeper in water?
It increases
Why do pressure in liquid happen?
Because of the weight of the column of liquid above
Why is there more pressure at the bottom of a liquid
Particles are slightly packed, this pressure acts in all directions
Why are dam walls wedge shaped?
The pressure acting on a dam at the bottom of a reservoir is greater than the pressure acting near the top, so force needs to be spread at the bottom
What is atmospheric pressure?
Layer of air around the earth that is thin
What happens to atmospheric pressure as altitude increases?
It becomes less dense
What causes atmospheric pressure
Air molecules colliding with a surface
What happens as altitude increases?(3 points)
-Number of air molecules decreases
-Weight of air decreases
-less air above surface
