Exam 1

Question 1

Sources of Sound (5)

Answer 1

vibrating bodies
changing airflow
time-dependent heat sources; lightening
super-sonic flow
motion force, kinetic energy, potential energy

Question 2

speed =

Answer 2

distance/time

Question 3

instantaneous speed

Answer 3

Instantaneous speed is a measurement of how fast an object is moving at that particular moment

velocity: magnitude (instantaneous speed) and direction

Question 4

acceleration

Answer 4

rate at which velocity changes overtime
involves change in speed or direction or both

Question 5

newtons second law

Answer 5

acceleration is proportional to force and inversely proportional to mass

Question 6

force is a

Answer 6

vector, an object that has both a magnitude and a direction.
the pound is a unit of force and can therefore be equated to newtons but not kilograms

Question 7

acceleration was created by Galileo based on his

Answer 7

experiments with inclined planes

Question 8

inertia

Answer 8

an option in motion will stay in motion unless acted upon by another force

Question 9

whenever one object exerts force on a second object,

Answer 9

the second object in motion will stay in motion unless acted upon by an outside force

Question 10

newtons third law

Answer 10

cannon, cannonball

Question 11

the magnitude of a force can be measured using a

Answer 11

spring scale

Question 12

liquid always has

Answer 12

pressure on its container walls

Question 13

atomic theory of matter

Answer 13

Each chemical element is made of fundamental units called ATOMS
energy cannot be created nor destroyed

Question 14

pressure is defined

Answer 14

as the force per unit

Question 15

when fluids are in motion you measure the ____ ____ through the

Answer 15

flow rate through the equation of continuity

Question 16

streamline/ laminar flow are examples of

Answer 16

smooth flow

Question 17

turbulent flow has eddies so the

Answer 17

viscosity of the fluid is greater

Turbulent flows develop spinning or swirling fluid structures called eddies.

Question 18

a combination of

Answer 18

energy and matter create the universe

Question 19

energy (4)

Answer 19

mover of substance
both a thing and a process
observed when it is being transferred or transformed
a conserved quality

Question 20

work involves

Answer 20

force and distance
application is force
force x distance
W=Fd

Question 21

the work-energy theorem

Answer 21

the net work done by the forces on an object equals the change in its kinetic energy.

Question 22

potential energy

Answer 22

energy possessed by a body

Question 23

kinetic energy

Answer 23

energy possessed by a body in motion

Question 24

friction is a nonconservative force

Answer 24

if friction is present work, it doesn’t only depend on the start and finish but also the path taken

Question 25

conservative forces

Answer 25

gravitational, elastic, electric

Question 26

nonconservative forces

Answer 26

friction, air resistance, tension in a cord, motor or rocket propulsion, push or pull by a person

Question 27

distance =

Answer 27

speed x time

Question 28

the motion of particles in a wave can either be perpendicular (a) or parallel (b)

Answer 28

(a) transverse
(b) longitudinal

Question 29

a wave is pictorially represented by a

Answer 29

sine curve

Question 30

a period is

Answer 30

measuring the time it takes for something vibrating to oscillate back and forth

Question 31

surface is

Answer 31

frictionless

Question 32

displacement is measured

Answer 32

on the equilibrium point

Question 33

crests

Answer 33

high point in the wave

Question 34

troughs

Answer 34

low point in the wave

Question 35

wavelength (graph)

Answer 35

length

Question 36

amplitude (graph)

Answer 36

height from the equilibrium point

Question 37

vibrating bodies vibrate in the air

Answer 37

and causes local air pressure to increase and decrease slightly, these pressure fluctuations travel outward as a new sound wave

Question 38

changing airflow

Answer 38

singing, vocal cords open and close

Question 39

time-dependent heat sources

Answer 39

thunder results from rapid heat in air by bolt

Question 40

supersonic flow

Answer 40

shock waves result when air flows faster than the speed of light, bullet

Question 41

amplitude is the

Answer 41

MAX displacement

Question 42

if the mass is at the limits of its motion the energy is all

Answer 42

potential

Question 43

if the mass is at the equilibrium point the

Answer 43

energy is kinetic

Question 44

velocity =

Answer 44

frequency times the wavelength (in the period)

Question 45

a phase is

Answer 45

the exact position of waves