Flashcards in force, gravity, and pressure ppt Deck (69):

1

## what are the SI unit of measurement

###
m

kg

s

A

mol

cd.

2

## what are the Englinsh comparison to the SI units?

###
lb

oz

inch

foot

yard

F

3

## what are the metric system measurements

###
mL

kg

cm3

4

## In physics what unit of measure is most freq used

### SI

5

##
whats the quanity and unit

m

###
length

meter

6

##
whats the quanity and unit

kg

###
mass

kilogram

7

##
whats the quanity and unit

s

###
time

second

8

##
whats the quanity and unit

A

###
electric current

ampere

9

##
whats the quanity and unit

K

###
temp

kelvin

10

##
whats the quanity and unit

mol

###
quanity of a substance

mole

11

##
whats the quanity and unit

cd

###
luminosity

candle

12

## what is quanity described by a single unit

### scalar

13

## what are the characteristics of scalar

###
size/magnitude

mass

temp

length

14

## what deals with magnitude and direction

### vector

15

## what are the characteristics of a vector

###
displacement

velocity

acceleration

force

16

## force is a ______

### vector

17

## what is a sum of all vectors on a given object?

### force (net force)

18

## does zero net force constitute zero forces acting upon an object

### no

19

##
what law and who made it?

an object will remain at rest or in motion indefinitely unless a net force act upon it? (inertia)

###
Newton's

law of motion #1

(inertia)

20

##
what law and who made it?

force is proportional to a specific mass and an acceleration in a specific direction

###
Newtons

law of motion #2

(force)

21

##
what law and who made it?

for each force exerted on one body, there is an equal, but oppositely directed force on some other body interacting with it

###
Newtons law

Law of motion #3

22

## how to remember the laws (just for me you may not like)

###
1st- you'll remain in motion unless something acts upon you

2nd- the force you are moving is proportional to your mass and acceleration

3rd- while going there is a constant force against you interacting with it

23

## explain force when a man is pushing a car!

###
- man applies 1 force to car

- man applies one force to ground (friction coeff)

-Car applies force to ground (friction Coeff)

-car applies force to man

- gravity applies force to car and man

-molecules in the air applying resistance

24

## what is the standard unit of measurement of force

### newton

25

## equation for force?

### force= mass x acceleration

26

## Equaion for newton

### newton = kg x m / s^2

27

## what is a newton in layman's terms

### the amount of force required to move one kg of an object one meter per second squared

28

## mr. miller is 116kg is that his weight?

### no it's his mass

29

## what is the difference b/t pounds and kg

###
pounds are weight

kg is mass

30

## weight is a measure of what?

### mass in accordence with its gravitational relationship

31

## any 2 particles with mass have what between them?

### attractional force

32

## how do you find gravitational force?

###
Fg= G [(M1 x M2) / D2]

G=gravitational constant

M1 and M2= mass of 2 objects

D2= distance form central points of each object (squared)

33

## what is the gravitational constant?

### 6.67 x 10^-11 N m^2 / kg^2

34

## what does little g mean

###
gravitational constant for earth

35

## what does g=

###
9.81 ms^2 (m/s/s)

or

32 ft s^2 (ft/s/s)

36

## how do you calculate gravitational force (fw)

###
= g x m

fw = 9.81 ms^2 (m/s/s) or 32 ft s^2 (ft/s/s) x m

37

## everything close to the earths surface will fall or accelerate at what rate

### 9.81 m/s^2

38

## every kg of an object has a gravitational force of what

### 9.81 m/s^2

39

## what is the free fall vacume? what are its properties

###
-weight is the only force acting on the object

-mass of the object does not effect the motion

-shape of the object does not effect the motion

-----All objects fall at the same rate in a vacuum (galileo)

40

## what is free fall in the atmosphere? what are the properties?

###
-weight is the only force acting on the object

- comparing 2 objects, the higher velocity occurs for hreater weight, lower drag coeff (more streamlined), lower gas density (higher altitude), or smaller area

---- objects do not fall at the same rate through the atmosphere----

velocity

gas density

frontal area

drag coeff

41

## what are fractions of a newton

### dynes

42

## forces are measured in newtons, biut when very small forces are being measured what is used?

### dynes

43

## dynes are measured as (what is there equation)

### dynes= gm x cm / s^2

44

## in healthcare what is measured as a dynes?

### swans pvr and svr

45

## what is magnitude only?

### scalar

46

## what is magnitude and direction

### vector

47

## force and vector is measured in what?

### newtons

48

## gravitational force allows for what?

### weight measurements

49

## What is a measure of a given force dispersed over a specific area

### pressure

50

## pressure is measured in what?

### pascals

51

## pressure is inversly proportional to what?

### area

52

## pressure is directly proportional to what?

### force

53

## 1 pascal is equal to what?

###
1 n/m^2

1 newton per meter squared

54

##
when pascals is discussed with pressure

1 N/m^2 will equal what

### 102 gms/m^2

55

##
102 gms per square meter (gms/m^2) is a fairly small value so often times kilopascalse are used in the place of pascals!! so

1 N/m^2= 1 pascals so _______ N/m^2 = 1 kilopascal

### 1000 N/m^2

56

##
100 KPa (kilopascals) equals?

Atm

BAR

mmHg

Torr

cmH2O

lb/in^2

###
Atm- 1

BAR- 1

mmHg- 760

Torr- 760

cmH2O-1020

lb/in^2- 14.7

(just remember 1 atm= 760mmHg= 760 torr= 14.7 lbs/in^2)

then memorize the other 2

57

## what is a measure of the gravitational pull of the molecules and particles towards the center of the earth?

### atm pressure

58

## what is teh standard measurement of atm pressure at sealevel?

### 1 atm

59

## Higher the elevation the _______ the atm pressure? and why?

###
lower

- fewer molecules at higher elevation

- further distance b/t 2 objects

60

## the lower the elevation the _________ the atm pressure?

###
higher

like submerging into the water

61

## the presure in a fluid is transferable in an _________ system

### enclosed

62

## an open fluid system has an _________

### equilibrium

63

## an open fluid system had an equilibrium so when pressure is applied to this equilibrium the change in height of the fluid can be used to calculate the what?

### pressure change ( bp)

64

## what is gauge pressure??

### the pressure reading of a container of some kind, above and beyond atm pressure

65

## what is absolute pressure

### the combination of atm pressure an dany pressure above atm pressure

66

## what in our practice uses gauge and absolute pressures?

###
APL valve

downstage regulator

pressure regulators

O2 fail safe

O2 flush valve

67

## equation for pressure?

### pressure= force / area

68

## when force is constant and area increases what happens to pressure?

### decreases

69