# force, gravity, and pressure ppt Flashcards Preview

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

Flashcards in force, gravity, and pressure ppt Deck (69)
1
Q
what are the SI unit of measurement
A
m
kg
s
A
mol
cd.
2
Q
what are the Englinsh comparison to the SI units?
A
lb
oz
inch
foot
yard
F
3
Q
what are the metric system measurements
A
mL
kg
cm3
4
Q
In physics what unit of measure is most freq used
A
SI
5
Q
whats the quanity and unit
m
A
length
meter
6
Q
whats the quanity and unit
kg
A
mass
kilogram
7
Q
whats the quanity and unit
s
A
time
second
8
Q
whats the quanity and unit
A
A
electric current
ampere
9
Q
whats the quanity and unit
K
A
temp
kelvin
10
Q
whats the quanity and unit
mol
A
quanity of a substance
mole
11
Q
whats the quanity and unit
cd
A
luminosity
candle
12
Q
what is quanity described by a single unit
A
scalar
13
Q
what are the characteristics of scalar
A
size/magnitude
mass
temp
length
14
Q
what deals with magnitude and direction
A
vector
15
Q
what are the characteristics of a vector
A
displacement
velocity
acceleration
force
16
Q
force is a ______
A
vector
17
Q
what is a sum of all vectors on a given object?
A
force (net force)
18
Q
does zero net force constitute zero forces acting upon an object
A
no
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)
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)
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
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
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
24
Q
what is the standard unit of measurement of force
A
newton
25
Q
equation for force?
A
force= mass x acceleration
26
Q
Equaion for newton
A
newton = kg x m / s^2
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
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!!