Fluids & Pressure Flashcards
What are fluids?
Substances that have no defined form that can flow in all directions.
Are all liquid and gases fluids?
Yes.
What is pressure?
The measurement of force exerted on a surface and is measured in Pascals (Pa).
What is the formula for pressure?
P= F/A (force over surface area)
True or false: The larger the surface area, the lower the pressure.
True.
Why does the amount of pressure depend on the surface area?
The smaller the surface area is, the larger the pressure will be. For example, a needle has a small surface area, so all the pressure is put on the tip of the needle.
Fill in the blanks: The pressure will be _______ if the force applied is great. Therefore, the lesser the _____, the ______ the pressure.
The pressure will be *greater if the force applied is great. Therefore, the lesser the *force, the *lower the pressure.
Is an increase in surface area and a decrease in pressure, directly or inversely proportional? Why?
Inversely proportional, because one variable decreases with the increase in another variable and one variable increases with the decrease in another variable.
Is an increase in force and an increase in pressure directly or inversely proportional? Why?
Directly proportional, because one amount increases & another amount increases at the same rate
How does temperature affect pressure?
The higher the temperature, the more particles begin moving, the more collisions occur, which results in an increase in pressure. The same thing happens with a lower temperature, the particles move slower & have less collisions, which results in a decrease in pressure.
Does gas have a defined volume?
No, gases take up the shape of the container they’re in.
What will an increase in volume result in? (Pressure, collisions)
An increase in volume, results in a decrease in pressure which causes fewer collisions between particles since there’s more space.
What will a decrease in volume result in? (Pressure, collisions)
A decrease in volume results in an increase in pressure causing more collisions between particles since there’s less space.
How does the number of particles affect pressure?
In a container, the more particles there are, the more collisions will occur, which results in an increase in pressure. The same happens with a lower amount of particles in a container, there will be less collisions and a decrease in pressure.
Are liquids a compressible or incompressible fluid? Why?
Liquids are incompressible fluids because the space between particles (in a liquid) are so small, therefore when a force is applied the particles can’t squeeze into a smaller volume and eventually stick together causing the liquid to spill out.
