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Flashcards in Fluids Physics Deck (30):
1

What does specific gravity tell us?

How dense something is when compared to water

2

What is pressure?

Force divided by area

3

What is hydrostatic gauge pressure?

Pressure due to water in tank

4

What is hydrostatic gauge pressure proportional to?

Depth and density

5

Under what circumstances is total pressure not proportional to depth and density of the liquid?

When pressure on the surface does not equal zero

6

If the density of a liquid is constant it is said to be

Incompressible

7

What is buoyant force equal to?

Weight of the fluid displaced by the object

8

Archimedes principle

Buoyant force = weight of fluid displaced by the object

9

If density of object is less than density of fluid

Object will float

10

If object density greater than fluid density

Object will sink

11

When does static equilibrium result?

When object has same density as fluid

12

Pascals law

Confined fluid will transmit an externally applied pressure change to all parts of the fluid and container without a loss of magnitude

13

What is flow rate?

Volume of fluid that passes a particular point per unit time

14

What is flow speed?

How fast the fluid moves

15

When does flow speed increase?

When tubes narrow

16

When does flow speed decrease?

When tube widens

17

What is the relationship between flow speed and cross sectional area?

Inversely proportional

18

What are requirements for ideal fluid flow?

Fluid is incompressible, viscosity is negligible, streamlines are visible, flow rate is steady

19

What condition of flow does bernoullis equation apply to?

Ideal fluid flow

20

What is efflux speed?

How fast fluid will flow out

21

What is torcellis result?

Shows the efflux

22

When flow speed is greater, what is pressure?

Pressure is lower

23

What is stress?

Force divided by area

24

Why doesn't stress equal pressure?

It does not have to be perpendicular to the area that it acts on

25

What is strain?

Ratio of appropriate change in length to objects original length

26

What is Hookes law?

Stress is proportional to strain

27

What is Young's modulus?

Constant of proportionality for tensile or compressive stress

28

What is shear modulus?

Constant of proportionality for shear stress

29

For tensile tensile or compressive stress what is strain equal to?

Change in length over original length

30

For shear strain what is strain equal to?

Distance of shear over original length