1 Intro Class

Question 1

Mass

Answer 1

amount of matter in an object
scaler quantity (has magnitude, not direction)
Newton’s 1st Law
measure in Kg

Question 2

Newton’s 1st Law

Answer 2

Object in motion will remain in motion

Object at rest will stay at rest until force acts upon it

Question 3

Weight

Answer 3

• the gravitational force exerted/pulling on an object by an object of bigger mass
• W = (mass)(gravity)
• Vector quantity
• weight is a force–> gravity creates acceleration
• measured in Newtons

Question 4

Newton’s 2nd Law

Answer 4

Force = Mass x Acceleration

*relationship between an objects mass and the force required to move it

Question 5

Newton’s 3rd Law

Answer 5

for every action, there is an equal and opposite reaction

Question 6

Velocity

Answer 6

• displacement over time
• vector quantity
• displacement can be positive, negative or zero
• not r/t to speed, which does not take direction into account

Question 7

Vectors

Answer 7

• have magnitude and direction
• can be added together
• velocity, force, acceleration

Question 8

Acceleration

Answer 8

• how velocity changes with time

- vector quantity

Question 9

Scaler

Answer 9

• has magnitude, not direction

- length, age, temp, height, mass

Question 10

Gravity

Answer 10

• 9.8 m/s2
• universal attraction between all objects
• creates force –> causes acceleration

Question 11

Force

Answer 11

• push/pull
• F= ma
• if there is force, will be acceleration

Question 12

Pressure

Answer 12

-force over an area

P = Force/Area

Question 13

How to increase pressure…

Answer 13

increase force or decrease area

Question 14

psi

Answer 14

pounds per square inch

Question 15

Pa

Answer 15

Pascal, very small usually measured in kilopascals

Question 16

Torr or mmHg

Answer 16

units of pressure

1 torr = 1 mmHg

Question 17

Atm conversion

Answer 17

1 atm = 760 torr = 760 mmHg = 14 psi

Question 18

Atmospheric Pressure

Answer 18

• air pressure that results from the gravity pulling on the atmosphere
• changes depending on distance from sea level

Question 19

Barometer

Answer 19

measures atmospheric pressure
gives absolute pressure
utilizes mercury

Question 20

Syringe Diameter Effect

Answer 20

doubling the diameter of a syringe decreases the pressure by a factor of 4

Question 21

Manometer

Answer 21

measures pressure differences

Question 22

Aneroid

Answer 22

• greek for no liquid
• measures expansion/contraction of gas in bellow
• can be open or closed to atmosphere

Question 23

Bourdon Gauge

Answer 23

• type of aneroid gauge
• measures difference of atm vs cylinder pressure
• *even if gauge reads 0 (difference) there is still 14 psi in cylinder

Question 24

Work

Answer 24

W=(force)(displacement)

• expenditure of energy/a force through a distance
• joules
• gases do work

Question 25

State Functions

Answer 25

• path taken does not matter
• volume, pressure or temperature
  ex. )length, temp, age

Question 26

Energy

Answer 26

• the capacity for doing work

- cannot be lost or created, merely converted

Question 27

calorie vs Calorie

Answer 27

calorie - amount of energy needed to increase temp of 1 g of material up 1 degree celsius
Calorie- kilocalorie, measures food

Question 28

Kinetic Energy

Answer 28

energy in motion

Question 29

Potential Energy

Answer 29

stored energy

Question 30

Internal Energy

Answer 30

sum of KE + PE at molecular level

Question 31

Thermodynamics

Answer 31

how energy is converted from one form to another

Question 32

Temperature

Answer 32

measurement of tendency to gain or loose heat

Question 33

Heat

Answer 33

• energy which can be transferred

- measured in calories

Question 34

Zeroth Law of Thermodynamics

Answer 34

A=B=C

no energy movement from A–> C

Question 35

1st Law of Thermodynamics

Answer 35

-change in internal energy
Endothermic - energy flows into system
Exothermic - energy flows out of system (soda lime)
Expansion - work done by the system
Compression - work done to the system

Question 36

2nd Law of Thermodynamics

Answer 36

• heat flows from hot body to a cold body

- entropy

Question 37

3rd Law of Thermodynamics

Answer 37

an objects temperature cannot be lowered to absolute zero, will always have some energy

Question 38

Mechanisms of Heat Transfer

Answer 38

Convection (30%) - via gas/liquid
Conduction (20%) - direct interaction
Radiation (40%) - no direct contact
Evaporation (10%)

Question 39

Power

Answer 39

• rate of doing work

- Watts