how does light help us see things? how does light … · 1 how does light help us see things? ......
TRANSCRIPT
Name: Class: Date:
Light and Shadows
Consolidation Worksheet 1How Does Light Help Us See Things? How Does Light Travel? What Happens To Light When It Is Reflected? Answer the questions below.
a. When are we able to see things?
b. How are we able to see ourselves in the mirror? In the diagram below, use arrows to draw the path of light that enables us to see our own reflection.
c. What can you conclude about how light travels from your answer in ‘b’?
d. Name two ways mirrors are useful in daily life.
Mirror
© 2012 Alston Publishing House Pte Ltd Science SMART Teacher’s Guide Grade 5 341
Name: Class: Date:
Light and Shadows
Consolidation Worksheet 2How Are Shadows Formed? Ari and Tom are playing a game of shadow animals. Study the picture below and answer the questions that follow.
a. What are the three things that allow Ari and Tom to create the shadows?
1.
2.
3.
b. What would happen to the shadow animals if Ari were to move nearer to the wall while Tom moved further away from the wall?
c. What can you conclude from your answer in ‘b’?
342 © 2012 Alston Publishing House Pte LtdAdditional Teacher’s Resources
Name: Class: Date:
Light and Shadows
Consolidation Worksheet 3Why Can We See Through Some Objects But Not Others? / How Do We Measure the Intensity of Light? 1. Look at the pictures below and answer the questions that follow.
a. Rita shone a torchlight on items A, B and C. Which item would allow the most light to pass through? Why?
b. Which item would allow the least light to pass through? Why?
c. Which item would allow only some light to pass through? Why?
A B C
Name: Class: Date:
Light and Shadows
Consolidation Worksheet 2How Are Shadows Formed? Ari and Tom are playing a game of shadow animals. Study the picture below and answer the questions that follow.
a. What are the three things that allow Ari and Tom to create the shadows?
1.
2.
3.
b. What would happen to the shadow animals if Ari were to move nearer to the wall while Tom moved further away from the wall?
c. What can you conclude from your answer in ‘b’?
© 2012 Alston Publishing House Pte Ltd Science SMART Teacher’s Guide Grade 5 343
2. Study the table below and fill in the appropriate answers using the words in the box below. Each word can only be used once.
a. Rita would like to find out how much light passes through the objects above. What equipment can she use to measure the amount of light passing through?
b. What is the unit of measurement for light?
Opaque Clear plastic bag Glass panel
Metal doorCling film Translucent Frosted glass
Ceramic tile Shower curtain Cardboard
Transparent
Stained glass Aluminum foil
344 © 2012 Alston Publishing House Pte LtdAdditional Teacher’s Resources
3. Unscramble the letters that make up the words found in Column A. Then complete the sentences in Column B by matching to the words in Column A.
We use to show clearly that light can be reflected.
A is a dark area that is formed when an object blocks the path of light.
Light travels in lines.
objects do not allow light to pass through.
We can see objects around us because these objects
light to our eyes.
Objects that allow most of the light to pass through them are .
is a form of energy that allows us to see.
When we look into a mirror, we see our own .
T T G A I H S R
R I R O R M S
P T N E R A R A N S T
W O H D A S
G A I M E
P O E A U Q
T E R F L E C
H I L T G
Column A Column B
2. Study the table below and fill in the appropriate answers using the words in the box below. Each word can only be used once.
a. Rita would like to find out how much light passes through the objects above. What equipment can she use to measure the amount of light passing through?
b. What is the unit of measurement for light?
Opaque Clear plastic bag Glass panel
Metal doorCling film Translucent Frosted glass
Ceramic tile Shower curtain Cardboard
Transparent
Stained glass Aluminum foil
© 2012 Alston Publishing House Pte Ltd Science SMART Teacher’s Guide Grade 5 345
Name: Class: Date:
Fun and Games
Light and Shadows
Mystery Shadow
Play this game with several friends in a semi-dark room. Prepare the set-up as shown below.
Your friends will hide behind a thin white curtain (you can use a thin white sheet) one at a time. You will not be able to see them but you can see their shadows on the white curtain when the light behind them is turned on.
Observe the shadows cast on the curtain and try to guess who they belong to.
Take turns to play the role of the person guessing.
The person who makes the most correct guesses wins the game!
Why are your friends able to cast their shadows on the curtain?
346 © 2012 Alston Publishing House Pte LtdAdditional Teacher’s Resources
Name: Class: Date:
Fun and Games
Light and Shadows
Mystery Shadow
Play this game with several friends in a semi-dark room. Prepare the set-up as shown below.
Your friends will hide behind a thin white curtain (you can use a thin white sheet) one at a time. You will not be able to see them but you can see their shadows on the white curtain when the light behind them is turned on.
Observe the shadows cast on the curtain and try to guess who they belong to.
Take turns to play the role of the person guessing.
The person who makes the most correct guesses wins the game!
Why are your friends able to cast their shadows on the curtain?
Name: Class: Date:
Exam Practice
Light and Shadows
Tom has some opaque and transparent sheets. He used the sheets, a torch and a ball to prepare the set-up below.
a. Tom observed that the shadow of the ball was formed only on Sheet C. Based on his observation, fill in the table below with the words ‘opaque’, ‘transparent’ or ‘cannot tell’. [4 marks]
b. If all the sheets were opaque, on which sheet(s) would the shadow of the ball appear? [1 mark]
Process skills: Observing, Analysing, Inferring
Sheet Opaque/Transparent/Cannot tell
A
B
C
D
Hint:Will a shadow form on an opaque
sheet or a transparent sheet?
Sheet D
Sheet C
Sheet B
Sheet A
© 2012 Alston Publishing House Pte Ltd Science SMART Teacher’s Guide Grade 5 347
Ans
wer
s to
Add
ition
al T
each
er’s
Res
ourc
esA
nsw
ers
to A
dditi
onal
Tea
cher
’s R
esou
rces
Nam
e:
C
lass
:
Dat
e:
Lig
ht
and
Sh
ado
ws
Co
nso
lid
atio
n W
ork
shee
t 2H
ow
Are
Sha
dow
s Fo
rmed
? A
ri an
d To
m a
re p
layi
ng a
gam
e of
sha
dow
ani
mal
s. St
udy
the
pict
ure
belo
w a
nd
answ
er th
e qu
estio
ns th
at fo
llow
.
a.
Wha
t are
the
thre
e th
ings
that
allo
w A
ri an
d To
m to
cre
ate
the
shad
ows?
1.
2.
3.
b.
Wha
t wou
ld h
appe
n to
the
shad
ow a
nim
als
if A
ri w
ere
to m
ove
near
er to
the
wal
l whi
le T
om m
oved
furt
her
away
from
the
wal
l?
c.
Wha
t can
you
con
clud
e fr
om y
our
answ
er in
‘b’?
A lig
ht s
ourc
e
An
obje
ct to
blo
ck th
e pa
th o
f lig
ht
A s
urfa
ce o
r sc
reen
whe
re th
e sh
adow
of a
n ob
ject
can
app
ear
Ari’
s sh
adow
ani
mal
wou
ld a
ppea
r sm
alle
r w
hile
Tom
’s sh
adow
ani
mal
wou
ld
appe
ar la
rger
.
Cha
ngin
g th
e di
stan
ce b
etw
een
the
scre
en a
nd a
n ob
ject
can
aff
ect t
he s
ize o
f
the
shad
ow c
ast.
(Acc
ept a
ll pos
sible
ans
wer
s.)
Nam
e:
C
lass
:
Dat
e:
Lig
ht
and
Sh
ado
ws
Co
nso
lid
atio
n W
ork
shee
t 1H
ow
Does
Lig
ht
Hel
p U
s Se
e Th
ing
s?
How
Does
Lig
ht
Tra
vel?
W
ha
t H
ap
pen
s To
Lig
ht
When
It
Is R
eflec
ted
? A
nsw
er th
e qu
estio
ns b
elow
.
a.
Whe
n ar
e w
e ab
le to
see
thin
gs?
b.
How
are
we
able
to s
ee o
urse
lves
in th
e m
irror
? In
the
diag
ram
bel
ow, u
se
arro
ws
to d
raw
the
path
of l
ight
that
ena
bles
us
to s
ee o
ur o
wn
refle
ctio
n.
c.
Wha
t can
you
con
clud
e ab
out h
ow li
ght t
rave
ls fr
om y
our
answ
er in
‘b’?
d.
Nam
e tw
o w
ays
mirr
ors
are
usef
ul in
dai
ly li
fe.
Mirr
or
Whe
n th
e th
ings
aro
und
us r
efle
ct li
ght i
nto
our
eyes
.
Light
trav
els
in a
str
aigh
t lin
e. /
The
pat
h of
ligh
t cha
nges
dire
ctio
n w
hen
refle
cted
off
a s
urfa
ce s
uch
as a
mirr
or o
r ot
her
obje
ct.
1. A
llow
s driv
ers t
o se
e th
e sid
e an
d be
hind
to c
heck
for
onco
min
g ca
rs w
hile
driv
ing.
2. A
llow
s us t
o gr
oom
our
selve
s in
the
mirr
or.
(Acc
ept a
ll pos
sible
ans
wer
s.)
348 © 2012 Alston Publishing House Pte LtdAdditional Teacher’s Resources
Ch
ap
ter 5
Ans
wer
s to
Add
ition
al T
each
er’s
Res
ourc
esA
nsw
ers
to A
dditi
onal
Tea
cher
’s R
esou
rces
2.
Stud
y th
e ta
ble
belo
w a
nd fi
ll in
the
appr
opria
te a
nsw
ers
usin
g th
e w
ords
in
the
box
belo
w. E
ach
wor
d ca
n on
ly b
e us
ed o
nce.
a.
Ri
ta w
ould
like
to fi
nd o
ut h
ow m
uch
light
pas
ses
thro
ugh
the
obje
cts
abov
e. W
hat e
quip
men
t can
she
use
to m
easu
re th
e am
ount
of l
ight
pass
ing
thro
ugh?
b.
W
hat i
s th
e un
it of
mea
sure
men
t for
ligh
t?
Opa
que
Cle
ar p
last
ic b
agG
lass
pan
el Met
al d
oor
Clin
g fil
mTr
anslu
cent
Fros
ted
glas
s
Cer
amic
tile
Show
er c
urta
inC
ardb
oard
Tran
spar
ent
Stai
ned
glas
sA
lum
inum
foil
Tran
sluce
ntO
paqu
e
Fros
ted
glas
s
Show
er c
urta
in
Cer
amic
tile
Car
dboa
rd
Met
al d
oor
Cle
ar p
last
ic b
ag
Clin
g fil
m
Gla
ss p
anel
A d
ata
logg
er
Lux
Nam
e:
C
lass
:
Dat
e:
Lig
ht
and
Sh
ado
ws
Co
nso
lid
atio
n W
ork
shee
t 3W
hy C
an W
e Se
e Th
roug
h S
om
e O
bje
cts
B
ut
Not
Oth
ers?
/ H
ow
Do W
e M
easu
re
the
Inte
nsi
ty o
f Li
ght?
1.
Look
at t
he p
ictu
res
belo
w a
nd a
nsw
er th
e qu
estio
ns th
at fo
llow
.
a.
Rita
sho
ne a
torc
hlig
ht o
n ite
ms
A, B
and
C. W
hich
item
wou
ld a
llow
the
mos
t lig
ht to
pas
s th
roug
h? W
hy?
b.
Whi
ch it
em w
ould
allo
w th
e le
ast l
ight
to p
ass
thro
ugh?
Why
?
c.
Whi
ch it
em w
ould
allo
w o
nly
som
e lig
ht to
pas
s th
roug
h? W
hy?
AB
C
Item
C. I
tem
C is
tran
spar
ent,
thus
it a
llow
s m
ost l
ight
to p
ass
thro
ugh
easil
y.
Item
B. I
tem
B is
opa
que,
thus
it d
oes
not a
llow
light
to p
ass
thro
ugh.
Item
A. I
tem
A is
tran
sluce
nt, t
hus
it al
low
s on
ly s
ome
light
to p
ass
thro
ugh.
© 2012 Alston Publishing House Pte Ltd Science SMART Teacher’s Guide Grade 5 349
Lig
ht
an
d S
ha
do
ws
Ans
wer
s to
Add
ition
al T
each
er’s
Res
ourc
esA
nsw
ers
to A
dditi
onal
Tea
cher
’s R
esou
rces
Nam
e:
C
lass
:
Dat
e:
Fu
n a
nd
G
ames
Lig
ht
and
Sh
ado
ws
My
ster
y S
had
ow
Play
this
gam
e w
ith s
ever
al fr
iend
s in
a s
emi-d
ark
room
. Pre
pare
the
set-
up a
s sh
own
belo
w.
Your
frie
nds
will
hide
beh
ind
a th
in w
hite
cur
tain
(yo
u ca
n us
e a
thin
whi
te s
heet
) on
e at
a ti
me.
You
will
not b
e ab
le to
see
them
but
you
can
see
thei
r sh
adow
s on
th
e w
hite
cur
tain
whe
n th
e lig
ht b
ehin
d th
em is
turn
ed o
n.
Obs
erve
the
shad
ows
cast
on
the
curt
ain
and
try
to g
uess
who
they
bel
ong
to.
Take
turn
s to
pla
y th
e ro
le o
f the
per
son
gues
sing.
The
pers
on w
ho m
akes
the
mos
t cor
rect
gue
sses
win
s th
e ga
me!
Why
are
you
r fr
iend
s ab
le to
cas
t the
ir sh
adow
s on
the
curt
ain?
They
are
abl
e to
blo
ck th
e pa
th o
f lig
ht b
ehin
d th
em.
3.
Unsc
ram
ble
the
lette
rs th
at m
ake
up th
e w
ords
foun
d in
Col
umn
A. T
hen
com
plet
e th
e se
nten
ces
in C
olum
n B
by m
atch
ing
to th
e w
ords
in C
olum
n A
.
We
use
to s
how
cl
early
that
ligh
t can
be
refle
cted
.
A
is a
dar
k ar
ea th
at
is fo
rmed
whe
n an
obj
ect
bloc
ks th
e pa
th o
f lig
ht.
Light
trav
els
in
line
s.
obj
ects
do
not a
llow
lig
ht to
pas
s th
roug
h.
We
can
see
obje
cts
arou
nd
us b
ecau
se th
ese
obje
cts
ligh
t to
our
eyes
.
Obj
ects
that
allo
w m
ost o
f th
e lig
ht to
pas
s th
roug
h th
em a
re
.
is a
form
of e
nerg
y th
at a
llow
s us
to s
ee.
Whe
n w
e lo
ok in
to a
mirr
or,
we
see
our
own
.
T T
G A
I H
S R
R I
R O
R M
S
P T
N E
R A
R A
N S
T
W O
H D
A S
G A
I M
E
P O
E A
U Q
T E
R F
L E
C
H I
L T
G
C
olum
n A
C
olum
n B
STRA
IGHT
MIR
RORS
TRA
NSP
ARE
NT
SHA
DO
W
IMA
GE
OPA
QUE
REFL
ECT
LIG
HT
350 © 2012 Alston Publishing House Pte LtdAdditional Teacher’s Resources
Ch
ap
ter 5
Ans
wer
s to
Add
ition
al T
each
er’s
Res
ourc
es
Nam
e:
C
lass
:
Dat
e:
Ex
am P
ract
ice
Lig
ht
and
Sh
ado
ws
Tom
has
som
e op
aque
and
tran
spar
ent s
heet
s. He
use
d th
e sh
eets
, a to
rch
and
a ba
ll to
pre
pare
the
set-
up b
elow
.
a.
Tom
obs
erve
d th
at th
e sh
adow
of t
he b
all w
as
form
ed o
nly
on S
heet
C. B
ased
on
his
obse
rvat
ion,
fil
l in
the
tabl
e be
low
with
the
wor
ds ‘o
paqu
e’,
‘tran
spar
ent’
or ‘c
anno
t tel
l’. [4
mar
ks]
b.
If a
ll th
e sh
eets
wer
e op
aque
, on
whi
ch s
heet
(s)
wou
ld th
e sh
adow
of t
he b
all
appe
ar?
[1 m
ark]
Pro
cess
sk
ills
: Obs
ervi
ng, A
naly
sing,
Inf
errin
g
Shee
tO
paqu
e/Tr
ansp
aren
t/Can
not t
ell
A B C D
Hin
t:W
ill a
shad
ow f
orm
on
an o
paqu
e sh
eet
or a
tra
nspa
rent
she
et?
Shee
t D
Shee
t C
Shee
t B
Shee
t A
Tran
spar
ent
Tran
spar
ent
Opa
que
Can
not t
ell
Shee
t A
© 2012 Alston Publishing House Pte Ltd Science SMART Teacher’s Guide Grade 5 351
Lig
ht
an
d S
ha
do
ws
Glossary
GlossaryChapter 5: Light and Shadows
Intensity of light The amount of light that is able to pass through a material
Lux The unit of measurement of light intensity
Opaque Does not allow light to pass through
Reflect The ability of light to bounce off an object
Reflection An image formed when an object is in front of a mirror or when light is reflected by a mirror
Translucent Allows only some light to pass through
Transparent Allows most light to pass through
352 © 2012 Alston Publishing House Pte Ltd
Ch
ap
ter 5