AS Physics Glossary [from Heinemans OCR spec A]

Ocr physics glossary for specification A as physics.

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  • Created on: 11-12-10 13:16
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absorption spectrum A
spectr
um of
dark l
i
n es
across
the
patt
ern
o f
spect
ral
col
ours
pr
oduced when l
i
g ht
passes
thr
ou gh
a gas
and t
he gas absor
bs
cer
tai
n f
requenci
es dependi
ng
on t
he el
eme nt
s i
n t
he
gas.
acceleration (a) The
rat
e of
change
of vel
oci
ty,
measur
ed
in
met
res
per
second
­2
squar
ed (
m s)
a vect
or
quanti
ty
.
acceleration of free fall The
accel
erat
ion
of a
body
fal
li
ng
under
gr
avi
ty.
On
Ear
th
it
has
the
­2
(g) val
ue
of
9.81
m s.
ammeter A
device
used
to
me asur
e el
ect
ri
c
cur
rent
,
connect
ed
in
ser
ies
wi
th
the
comp onent
s.
amount of substance SI
quant
it
y,
measur
ed
in
mol
es
(mol
).
ampere SI
uni
t
for
el
ect
ri
c cur
rent
,
e.g.
4
A.
amplitude (xo) The
ma xi
mum di
spl
acement
of
a
w ave
fr
om
it
s mean
(or
r
est
)
posi
ti
on,
measur
ed
in
met
res
(m).
antinode A
p oi
nt
of
ma xi
mum amp l
it
ude
along
a st
ati
onar
y wave
caused
by
const
ruct
ive
int
erf
erence.
area (A) A
physi
cal
quant
it
y r
epr
esent
ing
the si
ze
of
par
t
of
a sur
face,
2
measur
ed
in
me t
res
squar
ed (
m) .
average speed A
measur
e of
t
he
tot
al
dist
ance
tr
avel
led
in
a cer
tai
n t
ime.
braking distance The
dist
ance
a vehi
cl
e t
ravel
s whi
le
decel
erat
ing
to
a st
op.
brittle A
ma t
e r
ial
t
hat
dist
ort
s ver
y l
it
tl
e even
w hen
subj
ect
t
o a
lar
ge
st
ress
and does
not exhi
bit
any
plast
ic
def
ormati
on f
or
example,
concr
ete.
Celsius see
degr
ee
C el
si
us.
centre of gravity The
po i
nt
at
w hi
ch t
he
ent
ir
e wei
ght
of
an
obj
ect
can
be
consi
dered t
o act
.
centre of mass see
centr
e of
gr
avit
y (
N .
B al
though
ther
e i
s a
techni
cal
di
ff
erence
it
i
s not
r
equir
ed at
t
his
level
).
charge see
elect
ri
c char
ge.
coherence Two
waves
w i
t
h
a const
ant
phase
rel
ati
onshi
p.

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Par
ts
of
elect
ri
c ci
rcui
ts,
i
ncl
udi
ng
bul
bs,
LDRs,
t
her
mist
ors,
et
c.
components of a The
resul
ts
fr
om
resol
vi
ng
a si
ngl
e vect
or
int
o hor
izont
al
and
vector ver
ti
cal
par
ts.
compressive force Two
o r
mor
e f
orces
that
have
the
eff
ect
of
r
educi
ng
the
vol
ume
of
t
he obj
ect
on
w hi
ch
they
are
acti
ng.…read more

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How f
ar
one posi
ti
on i
s f
rom
anot
her
,
measur
ed
in
met
res
(m)
,
e.g.
12
m a
scal
ar
quan t
it
y.
drag The
resi
sti
ve
for
ce
that
act
s on
a body
w hen
it
moves
thr
ough
a
f
lui
d.
drag coefficient A
char
a ct
eri
st
ic
that
det
ermi
nes
the
amount
of
dr
ag
that
act
s on
an
obj
ect
.…read more

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The
process
of di
ff
ract
ing an
elect
ron
thr
ough
a gap
(usual
ly
bet
w een
atoms i
n a c
rystal
st
ruct
ure,
f
or
example
graphi
te)
.
A n
example
of
w ave­part
icl
e dual
it
y.
electron flow The
movement
of
el
ect
rons
(usual
ly
around
a ci
rcui
t)
,
f
rom
­ t
o +.…read more

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An el
ectr
ical
component
designed
to
heat
up,
me lt
and
break
the
ci
rcui
t
(hence st
op
the
current
) when
a speci
fi
ed amount
of
elect
ri
c
cur
rent
passes t
hrough
it
.
U sed
as a
saf
ety
de vi
ce.
­2
g, acceleration of free The
accel
erat
ion
of
a body
under
gr
avi
ty,
9.
81
m s .…read more

Page 6

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Uni
t
of
e ner
gy (
J),
e.g.
1200
J.
1 J
is
the
w or
k done
w hen
a f
orce
of
1
N
mo ves
it
s poi
nt
of
appli
cati
on 1
m in
the
dir
ecti
on of
t
he
f
orce.
kelvin SI
uni
t
of
temper
atur
e (
K),
e.
g.
373
K.
kilowatt Uni
t
of
power
(
kW)
,
e.g.
3.
5 kW.
1k
W =
1000
W.…read more

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Uni
t
of
for
ce
(N),
e.g.
4000
N .
1
N
is
the
for
ce
w hi
ch
gives
a mass
­2
of
1
kg
an accel
erat
ion
of
1 m s.
node A
p oi
nt
that
al
ways has
zero
amp l
it
ude
along
a s
tat
ionar
y wave
caused
by dest
ruct
ive
int
erf
erence.
­1
ohm Uni
t
of
resi
stance
( )
,
e.g.
24
.
1
= 1
V A .…read more

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The
elect
ri
cal
energy
per
unit
char
g e
w hen
elect
ri
cal
ener
gy
is
p.d. conver
ted
int
o some ot
her
for
m o f
energy.
potential divider A
type
of
cir
cui
t
contai
ning
two
comp onent
s desi
gned
to
divi
de
up
t
he p.
d.
in
propor
ti
on
to t
he r
esi
stances
of
the
components.…read more

Page 9

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The
over
all
vel
oci
ty
w hen
combi
ng
two
or
mor
e vel
oci
ti
es.
scalar A
ph ysi
cal
pr
opert
y wit
h magnit
ude
(si
ze)
but
not
dir
ecti
on
for
example,
speed,
di
stance,
pr
essur
e,
potent
ial
di
ff
erence,
et
c.…read more

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The
veloci
ty
at
w hi
ch
a n
obj
ect
's
drag equal
s
it
s accel
erat
ing
f
orce.
Ther
e f
ore
there
is
no
resul
tant
f
orce
and zer
o accel
erat
ion.
thermistor A
component
t
hat
ch anges
it
s r
esi
stance
dependi
ng on i
ts
t
emper
atur
e.
An
N TC t
hermist
or'
s r
esi
stance
reduces
as t
he
t
emper
atur
e i
ncreases.…read more

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