Exam 1 Flashcards
Sources of Sound (5)
vibrating bodies
changing airflow
time-dependent heat sources; lightening
super-sonic flow
motion force, kinetic energy, potential energy
speed =
distance/time
instantaneous speed
Instantaneous speed is a measurement of how fast an object is moving at that particular moment
velocity: magnitude (instantaneous speed) and direction
acceleration
rate at which velocity changes overtime
involves change in speed or direction or both
newtons second law
acceleration is proportional to force and inversely proportional to mass
force is a
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
acceleration was created by Galileo based on his
experiments with inclined planes
inertia
an option in motion will stay in motion unless acted upon by another force
whenever one object exerts force on a second object,
the second object in motion will stay in motion unless acted upon by an outside force
newtons third law
cannon, cannonball
the magnitude of a force can be measured using a
spring scale
liquid always has
pressure on its container walls
atomic theory of matter
Each chemical element is made of fundamental units called ATOMS
energy cannot be created nor destroyed
pressure is defined
as the force per unit
when fluids are in motion you measure the ____ ____ through the
flow rate through the equation of continuity
streamline/ laminar flow are examples of
smooth flow
turbulent flow has eddies so the
viscosity of the fluid is greater
Turbulent flows develop spinning or swirling fluid structures called eddies.
a combination of
energy and matter create the universe
energy (4)
mover of substance
both a thing and a process
observed when it is being transferred or transformed
a conserved quality
work involves
force and distance
application is force
force x distance
W=Fd
the work-energy theorem
the net work done by the forces on an object equals the change in its kinetic energy.
potential energy
energy possessed by a body
kinetic energy
energy possessed by a body in motion
friction is a nonconservative force
if friction is present work, it doesn’t only depend on the start and finish but also the path taken
conservative forces
gravitational, elastic, electric
nonconservative forces
friction, air resistance, tension in a cord, motor or rocket propulsion, push or pull by a person
distance =
speed x time
the motion of particles in a wave can either be perpendicular (a) or parallel (b)
(a) transverse
(b) longitudinal
a wave is pictorially represented by a
sine curve
a period is
measuring the time it takes for something vibrating to oscillate back and forth
surface is
frictionless
displacement is measured
on the equilibrium point
crests
high point in the wave
troughs
low point in the wave
wavelength (graph)
length
amplitude (graph)
height from the equilibrium point
vibrating bodies vibrate in the air
and causes local air pressure to increase and decrease slightly, these pressure fluctuations travel outward as a new sound wave
changing airflow
singing, vocal cords open and close
time-dependent heat sources
thunder results from rapid heat in air by bolt
supersonic flow
shock waves result when air flows faster than the speed of light, bullet
amplitude is the
MAX displacement
if the mass is at the limits of its motion the energy is all
potential
if the mass is at the equilibrium point the
energy is kinetic
velocity =
frequency times the wavelength (in the period)
a phase is
the exact position of waves
