basics of physics week 1

Question 1

Newtons first law

Answer 1

an object in motion will stay in motion unless an external force acts upon it. also known as the law of inertia.

Question 2

does an object with a greater mass require more force to move it? T/F

Answer 2

True

Question 3

Force =’s ?

Answer 3

Mass times Acceleration

Question 4

Newtons second law

Answer 4

The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.

Question 5

are force and acceleration both vectors T/F?

Answer 5

true

Question 6

Newtons third law

Answer 6

For every action, there will be an equal and opposite reaction.

Question 7

what is velocity?

Answer 7

velocity describes how the position of an object changes over time. V= displacement/ Time

Question 8

Is velocity a vector? T/F

Answer 8

true

Question 9

speed is ?

Answer 9

it is a rate of motion. rate of change in position. speed is a scaler value. it implies no particular direction. avg speed = distance/time. it is always positive.

Question 10

velocity is ?

Answer 10

speed with direction. change in direction over a given time. velocity involves displacement. which is a change in a position with respect to an origin.

Question 11

what is a vector?

Answer 11

a quantity having direction as well as magnitude, especially as determining the position of one point in space relative to another.

Question 12

vectors have two things?

Answer 12

Magnitude and direction

Question 13

Is mass a vector quantity?

Answer 13

NO

Question 14

can you add vectors togeather? T/F

Answer 14

True. example is Suppose you are walking 5mph south on a train moving 30mph south. what is your resulting velocity? 5+30=35 mph

Question 15

what is acceleration?

Answer 15

it describes how velocity changes with time.

Question 16

Is acceleration a vector?

Answer 16

yes, it is. so changing direction also causes acceleration.

Question 17

Acceleration measurement?

Answer 17

M/s squared. acceleration can occur with a change in speed, direction, or both.

Question 18

for projectiles a is the acceleration downward due to gravity what is it?

Answer 18

9.8 m/s squared downward.

Question 19

can velocity be negative?

Answer 19

yes it can if its in the opposite direction of its acceleration.

Question 20

what is force?

Answer 20

it is a push or a pull.

Question 21

what is force related to? and which of newtons laws?

Answer 21

it is related to mass and Newton’s second law. F=m(a)

Question 22

is force required to produce an acceleration? T/F

Answer 22

True

Question 23

what is gravity? and which law of newtons ?

Answer 23

it is the universal attraction between all objects. newtons third law

Question 24

what is the gravity of earth?

Answer 24

9.8 m/s squared. or 32.2 ft/s squared

Question 25

what is weight?

Answer 25

it is the gravitational force exerted on an object by another larger object like the earth. W= m(g) m=mass g= gravity.

Question 26

is weight a force?

Answer 26

yes thus it causes acceleration. comparable with F=m(a)

Question 27

Si unit of mass? and English unit of mass? Si unit of force?

Answer 27

SI mass= Kg Kilogram English = slug = 14.6 kg SI force= newton example is 9.8N= (1kg) x ( 9.8m/s squared) W= (m)g

Question 28

what is mass

Answer 28

amount of matter in an object

Question 29

English unit of force?

Answer 29

pound. example weight of one slug mass on the surface of the earth. 32.2 lb= (1slug) x ( 32.2ft/s squared)

Question 30

calculate the mass in kg and weight in N of a 150 lb person.

Answer 30

150/32.2 = 4.66 slug 4.66slug x 14.6 = 68 kg mass 68 x 9.8N/kg = 639N = weight in newtons.

Question 31

what is pressure?

Answer 31

pressure = Force/ area pressure is force per unit area Pressure can be increased by either increasing the applied force or by decreasing the area the force is applied. and vice versa.

Question 32

units of pressure (important) (slide 19)

Answer 32

pounds per square inch. (PSI) also know in Pascal (Pa) = 1 newton per square meter however, 1 Pa is tiny so we use Kilopascals (kPa) Torr or mmHg ( 1 Torr = 1 mmHg) atmosphere (atm) Bar 1 atm = 760 torr= 760 mmHg = 101325 Pa 1 atm = 1.013 bar 1 bar = 100,000 Pa = 10 to the 5th Pa= 100 kPa

Question 33

mmHg is equal to?

Answer 33

the amount of pressure to suspend a column of mercury 1mm in height.

Question 34

atm is measured in what?

Answer 34

inches of mercury and usually referenced to sea level.

Question 35

formula for pressure

Answer 35

pressure = Force/ area syringe video example (slide 21)

Question 36

atmospheric pressure

Answer 36

results from gravity pulling on the atmosphere, and the resulting force is spread over all earths surface. atmospheric changes depend on distances from sea level. ex. pressure in Denver is less then new Orleans this also affects oxygen and gas concentrations of inspired inhalation anesthetics.

Question 37

Barometer ( slide 24)

Answer 37

instrument used to measure atmospheric pressure.

Question 38

manometer (slide 25)

Answer 38

used to measure pressure differences.

Question 39

Aneroid gauge ( slide 26)

Answer 39

means without liquid greek. rely's on expansion and contraction of bellows as pressure changes.

Question 40

Aneroid style gauge is found on what? (slide 27) also called a Bourdon Gauge.

Answer 40

gas cylinder such as oxygen, air, and Nitrous oxide.

Question 41

this type of gauge measures gas not liquid?

Answer 41

Bourdon gage. even when the tank is empty it still has 14.5 psi or atmospheric pressure.

Question 42

daltons law of partial pressure

Answer 42

air is 21% nitrogen 79%

Question 43

gauge pressure and total pressure

Answer 43

suppose a tank of gas has a gauge pressure that reads 45 psi. if the atmospheric pressure is at that time 14 psi, how much gas is really in the tank? P total = P gauge + Patm so 45psi+ 14psi = 59 psi

Question 44

1 atmosphere is = to ?

Answer 44

14 psi

Question 45

non- invasive blood pressure is called

Answer 45

oscillometry. relies on oscillations.

Question 46

what is a transducer

Answer 46

device that interconverts a signal between nonelectric and electrical domains.

Question 47

piezoelectric transducer

Answer 47

non-electric pressure changes that impact the transducer creating a voltage that is proportional to the pressure change