Flashcards in C8 Terms Deck (41):

1

## The study of how fluids flow and how forces and energy are transmitted through fluids

### Fluid mechanics

2

## The ratio of forces to the area

### Pressure (P)

3

## A pressure is exerted equally in all directions

### Fluid pressure

4

## The SI base unit of pressure

### pascal (Pa)

5

## Water pressure due to depth

### hydrostatic pressure

6

## A thick walled glass tube filled with liquid mercury and sealed on one end

### mercury barameter

7

## Contains a accordion like can filled with a low pressure gas

### aneroid barometer

8

## Fluid pressures is measured with?

### gauge

9

## An immersed object is lifted or buoyed up by a force equal to the weight of the fluid displacement. This is called the buoyant force

### Archimedes' principle

10

## States that an immersed object is lifted up by a force equal to the weight of the fluid displaced

### buoyant force

11

## Comparing the density of an object to the density of water

### specific gravity

12

## Changes of pressure on a fluid are exerted equally throughout the fluid

### Pascal's principle

13

## Hydraulic machine

### They produce MA by magnifying a small force on a confined liquid to make a large force on the load

14

## Hydraulics

### Using a liquid to exert a force

15

## Bernoulli's principle

### Pressure In a pipe is related to he waters height and it's velocity

16

## Venturi

### A pressure meter that uses flow

17

## Lift

### An upward force p

18

## Coanda effect

### The diverting of the path of water flowing around a cylinder

19

## Air foil

### Any surface that is designed to deflect air or create a force as it moves though the air

20

## Boyle's law

### The inverse relationship between the volume and pressure of a confined gas

21

## Charles law

### The volume of a fixed amount of gas changes in the same way as it's absolute temperature

22

## What property of fluids necessitated the development of fluid mechanics as an area of science separate from standard mechanics?

### Because they have special physical properties such as lack of rigidity.

23

## How is pressure calculated?

###
Pressure is calculated using the formula

F

P=----

A

Where

• P is pressure in newtons per square meter

• F is the net force acting perpendicular to the surface in newtons

• A is the total surface area over which the force is applied

24

## How does pressure change when each of its contributing factors is increased?

### When force is increased the pressure rises. When the area is increased the pressure goes down.

25

## How does pressure exerted by a solid object on a surface differ from pressure exerted within a liquid or a gas?

### Liquids and gases exert pressure in all directions and a solid can only exert a pressure in one direction

26

## What combination of SI units is the pascal equal to?

### Newtons per square meter

27

## What pressure unit is used in weather prediction?

### The bar

28

##
What 2 factors affect the pressure in a fluid?

How does gravity affect each of these?

###
Depth and density

If there was no gravity the depth would not make a difference. Gravity pulls down on the particles and compresses the ones that are below the surface

29

## What 2 aspects of a fluid do not affect fluid pressure?

### Shape and volume

30

## List the 3 kinds of buoyancy

### Objects the float objects the sink, and objects that hover

31

## Why is specific gravity useful?

### It is useful as an identifying property of substances especially solutions and other mixtures

32

## (T/F) If a mercury barometer were taken into a deep mine on a typical day, the mercury column would probably be taller than 760 mm.

### False

33

## What conditions must exist for pascal's principle to be true?

###
The fluid must be totally contained

The fluid must be incompressible

34

## What is one way to compute the ideal MA of a simple hydraulic machine?

### Divide the area of the resistance piston be the area of the effort piston

35

## What is the most important condition that must exist for a fluid to flow?

### Pressure

36

## (True or false) A manually operated hydraulic jack applies the Bernoulli principle to amplify effort to do work.

### False

37

## Research in gases lead to the acceptance of what principal theory of science.

### The theory of particle matter

38

## What three factors contribute to gas pressure.

### Temperature, the number of gas molecules in a volume of gas, and the number of collisions per second

39

## If the volume of a confined gas triples what happens to the gas's pressure?

### It will be one third of the original pressure

40

## When a confined gas experiences a temperature change which of the three factors from the question above could change the pressure of the gas?

### The speed of the molecules

41