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Chem and Physics llA
Force, gravity and pressure
| Question | Answer |
|---|---|
| Units of Measure | International system units (SI) -m, kg,s,A,K,mol, and cd. English Customary units -ib., oz., inch, foot, yard, degree faringht,. Metric System -ml, kg, cm3. |
| In Physics | SI units are most frequently used. Often times one must convert from other forms of measure to accurately calculate and answer specific equations of problems. |
| What is a Scalar | Scalar are quantity described by single unit. for examples : size or magnitude, mass, temperature and length. |
| What is a Vector | Vector deals with magnitude and direction. for examples displacement , velocity, acceleration, force. |
| Force | Force is a vector. Sum of all vectors on a given object or system. Net force. Zero net force does not necessarily constitute zero forces acting upon an object. |
| Who is Newton? or what is Newton? (law # 1) | Law of Motion #1 An object will remain at rest or in motion indefinitely unless a net force acts upon the object ( inertia) Also known as the law of inertial. |
| Newton law #2 | Forceis proportional to a specific mass and an acceleration in specific direction. |
| Newton law #3 | For each force exerted on one body, there is an equal, but oppositely directed force on some other body interacting with it. |
| Force (eg) | Man applies one force to car. Man applied one force to ground ( friction coeff). car applied force to ground ( friction coeff). car applies force to man. Gravity applied forces to car and man. Molecules in air applying resistance.... |
| How is force measured? | Standard unit of measure of force; Newton -force = mass x acceleration -Newton = kg x m/s^2 -Layman's terms A newton is the amount of force required to move one kilogram of an object one meter per second per sound |
| Weight -I am approx 116 kg? -Is it my wt? -What does wt quantify? | No This is not your wt. it is your mass. |
| Are pounds a mass or weight? | pound is a weight |
| weight 1 kg at 32 ft/s/s is equal to | 2.2 ibs |
| 9.8 N | 2.2 ibs |
| 4.46 N is equal to | pound |
| How is weight measured? | weight is measure of mass in accordance with it's gravitational relationship. |
| How do we find the gravitation force | Any two particles with mass have an attraction force between them |
| Fg = | G[(M1 x M2)/D^2] -G=6.67 x 10^-11 N m2/kg2 -M1= Mass of the first object -m2= Mass of the second object -D= Distance from the central points of each object. |
| What is the Earth's weight | 5.98 x 10^24 kg (Me) |
| What is the earth radius | 6.38 x 10 ^6 m |
| What is the Gravitational constant | G = 6.67 x 10^-11m^2/kg^2 |
| W | G x Me/r^2 x m2 |
| Fw = g x m | g = 9.81m/s/s or 32 ft/s/s |
| We know that related to gravitational forces.... -everything close to the earths surfaces will | fall or accelerate at 9.81m/s2 |
| Thursly, every kilogram of an object has a .... | gravitational force of 9.81m/s2(g) and this is known as the weight of an object. |
| Free fall (vacuum) | weight is the only force acting on an object. F=W=m g. There is no terminal velocity here. The only thing acting on here is gravity there fore every thing will drop at the same rate, same time as far as there no terminal velocity. |
| Mass of the object does not affect the motion ( true or force) | True |
| Shape of the object does ot affect the motion ( true or force) | True |
| Does all object fall at the same rate in a vacuum | Yes. they do. |
| Free fall ( in atmosphere) | Objects do not fall at the same rate through the atmosphere. There is a terminal velocity with atmosphere falls. and because of that they are falling any faster. In here. wt is the only thing acting here. |
| Cd p V2A/2 = W | V = velocity P - gas density A = frontal area Cd = drag coefficient |
| Comparing two objects, the higher the velocity occurs for greater weight, lower drag coefficient (more streamlined), the lower gas density ( higher altitude), or smaller area ( true or false) | True. |
| Dynes | Forces are measure in newtons and when they are very small this forces are being measured in dynes. |
| How is Dynes measured | Dynes is measured in gm x cm/s2 |
| Remember that | SI unit, Scalar - magnitude only; Vector - magnitude and direction; Force - Vector-measured in newtons; Gravitational force allows for weight measurements., Understand the differences between net force of zero and no forces interacting on an object. |
| What is pressure | Pressure is a measure of a given force dispersed over a specific area. P = F/a |
| What is pressure measured in | Pascal |
| Pressure is inversely | proportional to area |
| Pressure is | proportional to force |
| What is pascal | Pascal is standard unit of pressure |
| 1 Pascal is equal to | one newton per metro squard (1 Pa = 1 N/m2) |
| 1 Pa is equal to what in Kg | 1 ( kg x m/s2)/m2 |
| When discussed with pressure, 1 N/m2 will equal | 102 gms/m2. this is derived from 1/9.81kg/s/s |
| In pressue 102 gms per square meter is a fairly small value ( true or False) | True. |
| Often times kilopascals are used in the place of pascals ( True or false) | True |
| 1 N/M2 is to pascals as 1000 N/m2 is to kilopascal (true or false) | True |
| Pressure Equivolents 100 KPa is equal to | 1 atmosphere 1BAR 760 mmhg 760 torr 1020 cmH20 14.4 1b/in2 |
| Pressure and it's importance | Atmospheric pressure Fluid pressures Gauge pressures Anesthetic pressure |
| Atmospheric Pressure | A measure of the gravitational pull of the moecules and particles towards the center of the earth |
| What is atmospheric pressure measured in | Standard is measured at sea level. -1 atmosphere (ATM) |
| With Atmospheric pressure | The higher the elevation the lower the atm pressure. -Fewer molecules at higher elevations to be effected by gravity -Same for submerging into water, the larger the depth, the larger the pressure exp.-Further dist b/w two obj reduces gravitational pu |
| Fluid pressure | The pressure in a fluid is transferrable in an enclosed system |
| An open fluid system has an equilibrium | When a pressure is applied to this equilibrium the change in height of the fluid can be used to calculate the pressure change. Ex. Sphygmomanometer (BP cuff) |
| Equation for manometer | change in P = pgh. P2-P1 = pgh [P1 = P(ATM) oftern times] |
| Gauge pressure:When the reading of a gauge on an oxygen cylinder reads zero, is the pressure in the cylinder zero? | No. the pressure is not zero. |
| What is a gauge pressure | The pressure reading of a container of some kind above and beyond atmospheric pressure |
| Absolute pressure | The combination of atmospheric pressure and any pressure above atmospheric pressure |
| Anesthetic implications | APL valve Downstage regulators Pressure regulators Oxygen fail safe system Oxygen flush valve |
| A 2 ml syringe can give a force/area of | 500 KPa |
| A 20m syringe can give you a force/area of | 100 Kpa |
| Pressure | Force/area |
| When force is constant and area increases what happen to pressure | the pressure decreases. |
| When force is constant and area decreases what happen to pressure | pressure increases. |
Created by:
eonaodow
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