Chapter 4.1 Flashcards
1
Q
What is the difference between fluids and solids
A
Fluids
->able to flow and conform to the shapes of their containers
Solids
- > do not flow
- > are rigid
- > retain their shape independent of their container
- > can only withstand shear(tangential) forces
2
Q
What is a similarity between fluids and solids
A
- both can exert forces perpendicular to their surface
- > fluids can impose large perpendicular forces
- but solids can withstand shear(tangential) forces
3
Q
What is specific gravity used for?
A
- it is a tool
- > used to see if an object will sink or float in water
- ratio greater than one
- > object will sink
4
Q
Is pressure a scalar quantity
A
- yes
- > it is magnitude but no direction
- pressure applies in all directions
- > at any point
5
Q
Does atmospheric pressure change with altitude
A
-yes
6
Q
What is absolute pressure? Describe the ambient pressure variable in this equation.
A
- total pressure that is exerted on an object
- > that is submerged in a fluid
- note there is incident or ambient pressure in this equation
- > in the atmosphere this is 1 atm
- > in other settings, such as the ocean, the ambient pressure may be higher
7
Q
What does gauge pressure?
A
- it is the difference between:
- > the absolute pressure inside the tire and the atmospheric pressure outside the tire
- it is the amount of pressure in a closed space
- > above and beyond atmospheric pressure
