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Chem / Physics II > force, gravity, and pressure ppt > Flashcards

force, gravity, and pressure ppt Flashcards

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1
Q

what are the SI unit of measurement

A 
m
kg
s
A
mol
cd.
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2
Q

what are the Englinsh comparison to the SI units?

A 
lb
oz
inch
foot
yard
F
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3
Q

what are the metric system measurements

A

mL
kg
cm3

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4
Q

In physics what unit of measure is most freq used

A

SI

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5
Q

whats the quanity and unit

m

A

length

meter

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6
Q

whats the quanity and unit

kg

A

mass

kilogram

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7
Q

whats the quanity and unit

s

A

time

second

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8
Q

whats the quanity and unit

A

A

electric current

ampere

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9
Q

whats the quanity and unit

K

A

temp

kelvin

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10
Q

whats the quanity and unit

mol

A

quanity of a substance

mole

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11
Q

whats the quanity and unit

cd

A

luminosity

candle

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12
Q

what is quanity described by a single unit

A

scalar

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13
Q

what are the characteristics of scalar

A

size/magnitude
mass
temp
length

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14
Q

what deals with magnitude and direction

A

vector

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15
Q

what are the characteristics of a vector

A

displacement
velocity
acceleration
force

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16
Q

force is a ______

A

vector

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17
Q

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

A

force (net force)

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18
Q

does zero net force constitute zero forces acting upon an object

A

no

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19
Q

what law and who made it?

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

A

Newton’s
law of motion #1
(inertia)

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20
Q

what law and who made it?

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

A

Newtons
law of motion #2
(force)

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21
Q

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

A

Newtons law

Law of motion #3

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22
Q

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

A

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

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23
Q

explain force when a man is pushing a car!

A
  • 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
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24
Q

what is the standard unit of measurement of force

A

newton

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25
Q

equation for force?

A

force= mass x acceleration

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26
Q

Equaion for newton

A

newton = kg x m / s^2

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27
Q

what is a newton in layman’s terms

A

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

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28
Q

mr. miller is 116kg is that his weight?

A

no it’s his mass

29
Q

what is the difference b/t pounds and kg

A

pounds are weight

kg is mass

30
Q

weight is a measure of what?

A

mass in accordence with its gravitational relationship

31
Q

any 2 particles with mass have what between them?

A

attractional force

32
Q

how do you find gravitational force?

A

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
Q

what is the gravitational constant?

A

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

34
Q

what does little g mean

A

gravitational constant for earth

35
Q

what does g=

A

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

36
Q

how do you calculate gravitational force (fw)

A

= g x m

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

37
Q

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

A

9.81 m/s^2

38
Q

every kg of an object has a gravitational force of what

A

9.81 m/s^2

39
Q

what is the free fall vacume? what are its properties

A
  • 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
Q

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

A

-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
Q

what are fractions of a newton

A

dynes

42
Q

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

A

dynes

43
Q

dynes are measured as (what is there equation)

A

dynes= gm x cm / s^2

44
Q

in healthcare what is measured as a dynes?

A

swans pvr and svr

45
Q

what is magnitude only?

A

scalar

46
Q

what is magnitude and direction

A

vector

47
Q

force and vector is measured in what?

A

newtons

48
Q

gravitational force allows for what?

A

weight measurements

49
Q

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

A

pressure

50
Q

pressure is measured in what?

A

pascals

51
Q

pressure is inversly proportional to what?

A

area

52
Q

pressure is directly proportional to what?

A

force

53
Q

1 pascal is equal to what?

A

1 n/m^2

1 newton per meter squared

54
Q

when pascals is discussed with pressure

1 N/m^2 will equal what

A

102 gms/m^2

55
Q

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

A

1000 N/m^2

56
Q 
100 KPa (kilopascals) equals?
Atm
BAR
mmHg
Torr
cmH2O
lb/in^2
A 
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
Q

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

A

atm pressure

58
Q

what is teh standard measurement of atm pressure at sealevel?

A

1 atm

59
Q

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

A

lower

  • fewer molecules at higher elevation
  • further distance b/t 2 objects
60
Q

the lower the elevation the _________ the atm pressure?

A

higher

like submerging into the water

61
Q

the presure in a fluid is transferable in an _________ system

A

enclosed

62
Q

an open fluid system has an _________

A

equilibrium

63
Q

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?

A

pressure change ( bp)

64
Q

what is gauge pressure??

A

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

65
Q

what is absolute pressure

A

the combination of atm pressure an dany pressure above atm pressure

66
Q

what in our practice uses gauge and absolute pressures?

A 
APL valve
downstage regulator
pressure regulators
O2 fail safe
O2 flush valve
67
Q

equation for pressure?

A

pressure= force / area

68
Q

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

A

decreases

69
Q

how is the last 2 slides applied to anesthesia?

A

the smaller syringe you use the higher pressure u get!!!

and the bigger syringe the less pressure u get!!

Chem / Physics II (20 decks)

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