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9th Grade Physical Science
9th Grade Physical Science
107
Science
9th Grade
11/05/2009

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Term
the image formed by a plane mirror is
Definition
upright and reversed
Term
the production of a spark is an example of
Definition
current
Term
the unit used to measure frequency is the
Definition
hertz
Term
what isn't true about a real image?
Definition
it appears behind the mirror
Term
electromagnetic induction is the process of producing an electric current by moving a loop of wire
Definition
throug a magnetic field
Term
when a firecracker explodes mass is...
Definition
gained
Term
when 2 or more substances are combined so each substance can be separated by physical means, the result is a
Definition
mixture
Term
3 examples of a physical change are
Definition
boiling of water, bursting of a balloon, crumplinga piece of paper
Term
according to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
Definition
the masses are equal
Term
according to the law of conservation of mass, if 2 atoms of hydrogen are used asa reactant, how many atoms of hydrogen must be part of the produt?
Definition
two
Term
a certain atom has 26 protons, 26 electrons and 30 neutrons. it's mass number is
Definition
26
Term
what is the formula for this compound...copper(I) sulfide
Definition
Cu2S
Term
what is the name for the following compound? ...CaBr2
Definition
calcium Bromide
Term
one isotope of uranium is u-238 how many protons and neutrons does it have?
Definition
92 protons 146 neutrons
Term
throuh which of the following will convection most likely occur/
Definition
liquids and gases
Term
unit used to measure heat is
Definition
calories
Term
one benefit of the SI system is that it is
Definition
based on multiples of ten
Term
if a fgraph is decelerating, what would the line look like?
Definition
curving upward
Term
the relationship among mass, force and acceleration is explained by
Definition
newton's second law of motion
Term
3 m/s north is an example of
Definition
velocity
Term
inerti varies depending on
Definition
mass
Term
the path of a projectile is
Definition
curved
Term
how many meters are there in 1, 865
Definition
18.65
Term
what is necessary for an object to accelerate
Definition
force
Term
motion is a change in
Definition
position
Term
2 cars are traveling along the same road at the ame speed but at differet velocities. explain.
Definition
cars are traveling in different directions
Term
a 10-kg wagon has a speed of 25 m/s what is it's momentum?
Definition
p=mv...10 x 25 momentum= 250 kgm/s
Term
find the acceleration of a car that goes from 32 m/s to 96 m/s in 8 s.
Definition
a=v/t ...8 m/s2
Term
a cross country runner runs 10 km in 40 mins. average speed?
Definition
15 km/hour
Term
precipitate
Definition
solid in double replacement lab
Term
speed of sound is faster in ___ than gas
Definition
solid
Term
frequency increases, so does the...
Definition
pitch
Term
angle in
Definition
angle out
Term
compared o gamma rays, x rays have...
Definition
longer waves, and less frequency
Term
light rays bend ___ from normal
Definition
away
Term
____ is the opposition to flow of electrons
Definition
resistance
Term
compass needle pts. parallel to ___
Definition
magnetic fields (north)
Term
voltage=12v current=3 amps resistance=??
Definition
V=IR (4 ohms)
Term
newton's 3rd law
Definition
action reaction
Term
newton's 2nd law
Definition
f=ma
Term
newton' 1st law
Definition
inerttia
Term
velocity increase on graph
Definition
curve upward
Term
constant velocity
Definition
linear uprise
Term
conclusion on pheoc
Definition
right/wrong, why? and refer 2 hypothesis
Term
dpendednt = ? independent = ?
Definition
d- y i- x
Term
cp stands for
Definition
specific heat
Term
3.25 km is how many cm?
Definition
325, 000 cm
Term
once liquid starts boiling the temp ______
Definition
stays thy same
Term
mass of proton or neutron
Definition
1 amu
Term
electron's mass?
Definition
Term
reaction
Definition
2 elements combine to make coumpuound.
Term
single replacement
Definition
exothermic, reaction released heat
Term
endothermic
Definition
we make it warm
Term
most reactive chemical?
Definition
magnesium
Term
what is the charge that has more protons than electrons?
Definition
positive ++++++
Term
parallel circuit, if vt = 1.5 and resistance in 1 resistor = .5 ohms what is the total current?
Definition
V=IR 1.5 = I x .5
Term
what is density?
Definition
refers to the ratio of mass per unit volume
Term
what is motion?
Definition
change in position. is relative
Term
speed
Definition
distance an object ravels per unit of time
Term
s = d/t
Definition
speed equals distance over time
Term
velocity is...
Definition
speed in a particular direction
Term
Pf - Pi / t
Definition
final time - initial time over change in time
Term
acceleration
Definition
change in velocity over a given time period
Term
a=v/t
Definition
acceleration= velocity/time
Term
force causes _____
Definition
acceleration
Term
what causes friction
Definition
unevenness of surfaces, contact between 2 surfaces
Term
types of friction
Definition
static: no motion b/w 2 sufraces
sliding: motion bw surfaces
rolling: type of static
Term
terminal velocity: all objects ___ as they fall
Definition
accelerate
Term
centripal force is the net force exetered toward the center of a ____
Definition
curved path
Term
momentum is the -__)____
Definition
force needed to change an object's mootion
Term
potential engery
Definition
stored eneryg
Term
kinetic energy
Definition
enegry due to motion
Term
sound waves are
Definition
vibrations
Term
sound needs a ___ in which to travel
Definition
medium
Term
pitch is the human ear version of...
Definition
frequency
Term
intensity of a sound wave ____ as the wave spreads out from the source of the sound
Definition
decreases
Term
electromagnetic radiation or light.
Definition
desn't need matter to ransfer enery
Term
absorptioin
Definition
absorbed
Term
transmission
Definition
passes thru
Term
reflection
Definition
bounces off
Term
ransluscent
Definition
some light
Term
opaque-
Definition
no light
Term
transparent
Definition
all light
Term
specular
Definition
regular light, no distortion
Term
refraction of light is the change in _____ from one meduim to another
Definition
speed of light
Term
concave mirrors
Definition
incoming parallelilht rays all reflect through the same poin t in front of the mirror. outgoing rays are parallel too
Term
convex mirrosrs
Definition
light diverges after hitting a convex mirror. everything appears smaller
Term
virtual image
Definition
an image appears to be real, but isn't
Term
nearsightedness, image forms +++++ of retina
Definition
in front.
concave lens
Term
farsightedness
Definition
image forms behind retina
convex lens to correct
Term
opposite charges...
Definition
attracgtt
Term
insulators ____ conduct easily
Definition
don't
Term
conductors ++++++ electrons to move freely
Definition
allow
Term
potential difference (volts)
Definition
difference in charge. the greater the potential diff. the fcaster charge will flow
Term
potential diff. in homes is
Definition
110 volts
Term
there must be a +++++ for electric charge to flow
Definition
circuit
Term
ohm's law
Definition
shows the relationship between potential difference, current and resitance
Term
series circuits have all parts of the circuite connected _____________
Definition
one after the other
Term
parallel circutis have different paths of the circuit on different brances
Definition
less lights go outt if a segment breaks
Term
magnets all have a notth and south ple
Definition
norht + norht repel. n+s attract
Term
thermal energy is...
Definition
h3at
Term
matter is composed of partiles
Definition
(atoms, molecules or ions)
Term
heat is...
Definition
transferred
Term
temperature is a measure of the
Definition
average kinetic engery of the particles
Term
heat movess....
Definition
warm to cold
Term
teh ++++++++ the specific is, the easier it is for the substance to not onl gain heat but to lose it too
Definition
lowerrrr
Term
q= m x (Tf =Ti) x C
Definition
heat transferred = mass x (final temp -initaltemp ) x specific heat
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