force, gravity, and pressure ppt Flashcards
Josh's guide to all of the fun shit in life
what are the SI unit of measurement
m kg s A mol cd.
what are the Englinsh comparison to the SI units?
lb oz inch foot yard F
what are the metric system measurements
mL
kg
cm3
In physics what unit of measure is most freq used
SI
whats the quanity and unit
m
length
meter
whats the quanity and unit
kg
mass
kilogram
whats the quanity and unit
s
time
second
whats the quanity and unit
A
electric current
ampere
whats the quanity and unit
K
temp
kelvin
whats the quanity and unit
mol
quanity of a substance
mole
whats the quanity and unit
cd
luminosity
candle
what is quanity described by a single unit
scalar
what are the characteristics of scalar
size/magnitude
mass
temp
length
what deals with magnitude and direction
vector
what are the characteristics of a vector
displacement
velocity
acceleration
force
force is a ______
vector
what is a sum of all vectors on a given object?
force (net force)
does zero net force constitute zero forces acting upon an object
no
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)
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)
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
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
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
what is the standard unit of measurement of force
newton
equation for force?
force= mass x acceleration
Equaion for newton
newton = kg x m / s^2
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
mr. miller is 116kg is that his weight?
no it’s his mass
what is the difference b/t pounds and kg
pounds are weight
kg is mass
weight is a measure of what?
mass in accordence with its gravitational relationship
any 2 particles with mass have what between them?
attractional force
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)
what is the gravitational constant?
6.67 x 10^-11 N m^2 / kg^2
what does little g mean
gravitational constant for earth
what does g=
9.81 ms^2 (m/s/s)
or
32 ft s^2 (ft/s/s)
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
everything close to the earths surface will fall or accelerate at what rate
9.81 m/s^2
every kg of an object has a gravitational force of what
9.81 m/s^2
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)
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
what are fractions of a newton
dynes
forces are measured in newtons, biut when very small forces are being measured what is used?
dynes
dynes are measured as (what is there equation)
dynes= gm x cm / s^2
in healthcare what is measured as a dynes?
swans pvr and svr
what is magnitude only?
scalar
what is magnitude and direction
vector
force and vector is measured in what?
newtons
gravitational force allows for what?
weight measurements
What is a measure of a given force dispersed over a specific area
pressure
pressure is measured in what?
pascals
pressure is inversly proportional to what?
area
pressure is directly proportional to what?
force
1 pascal is equal to what?
1 n/m^2
1 newton per meter squared
when pascals is discussed with pressure
1 N/m^2 will equal what
102 gms/m^2
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
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
what is a measure of the gravitational pull of the molecules and particles towards the center of the earth?
atm pressure
what is teh standard measurement of atm pressure at sealevel?
1 atm
Higher the elevation the _______ the atm pressure? and why?
lower
- fewer molecules at higher elevation
- further distance b/t 2 objects
the lower the elevation the _________ the atm pressure?
higher
like submerging into the water
the presure in a fluid is transferable in an _________ system
enclosed
an open fluid system has an _________
equilibrium
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)
what is gauge pressure??
the pressure reading of a container of some kind, above and beyond atm pressure
what is absolute pressure
the combination of atm pressure an dany pressure above atm pressure
what in our practice uses gauge and absolute pressures?
APL valve downstage regulator pressure regulators O2 fail safe O2 flush valve
equation for pressure?
pressure= force / area
when force is constant and area increases what happens to pressure?
decreases
how is the last 2 slides applied to anesthesia?
the smaller syringe you use the higher pressure u get!!!
and the bigger syringe the less pressure u get!!
