150 de mari experimente stiintifice - romana, pt copii, science experiments for kids, fun...
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5/21/2018 150 de Mari Experimente Stiintifice - Romana, Pt Copii, Science Experiments for Kids, Fun Experiments - (Scan by Waspul for Mirun) - slidepd
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Pt. Mirun
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P L NET i N ROT E
notimpurile
1
FOIosit i carioca pentru a desena
2
puneti lanterna pe carti in asa fel Incat
linie in jurul mij locului mingii. Aceasta sa lumineze
jum
atatea de mlnge de
reprezinta Ecuatorul. Asezati mingea deasupra Ecuatorului. Este
vara
in
deasupra bolului asttel i ncat linia j umatatea de rninge de deasupra
Ecuatorului sa se i ncline usor. Ecuatorului, unde lumineaza lanterna, $i
iarn a de cealalta jurnatate a lum ii.
Puterea
solara
Soarele revarsa energie Orbita
MARTIE
prirnavara in nord
pe Parn
nt
sub forma
Pamantul ui
,
$i toa rnna in sud
de ealdur a si lumina.
Cantitatea de energie
pnrnita in oriee loe de
pe Parnant se rnodifica
od t eu anotimpu rile.
Aeest lueru se
Soarele
datoreaza faptului ca
axa Parnantu lui este
lncl mata. Vara,
IUNIE
jum t te a Pamantului
vara
in
larna in nord $i
nord $i
e inc tinata spre Soare,
vara in sud
iarna in sud
$i aeolo este mai eald.
larna nu mai primeste
SEPTEMBRIE
asa multa lumina de la
toarnn a in nord $i
Soare, $i atunei e mai
primavara in sud
reee.
3
l.uminati Ecuatorul cu lanterna asHel
lncat
aceasta sa aru nce lumina egala
in fiecare ernisfera. Acest lucru este
echivalent cu primavara si toamna , cane
zilele noptile sunt de aceea si durata in
teats
lumea .
Construirea
unui
termometr
1
Turnati apa rece in tr-o st icla pana se
ump le la doua tre imi din capacitate.
Adaugati niste col
or nt liment r
. Mulati
paiul i n apa $i slgilati bine gatu l stic lei cu
adeziv refolosibil .
4
i nt r-o zi fierbinte, caldura Soare lui va
face ca aeru l $i apa sa se di late,
tortano nivelu l apei din pai pest e semnul
tacut pentru te mperatura c merei. Raciti
termometrul in frigide r.
Remarcati nivelur ile
diferi te .
2
imPingeti palul in jos spre a perm ite
3
Taiati cartcn asu l 1 Inf iget l-l pe pal.
aer ului sa mai patrunda in sti cla. l.asatl sticla sa stea putln . Faceti un
Dupa cateva secunde, presiunea aeru lui semn pe cartonas in dreptul nivelului apei
suplimentar din interior va torta nivelul pent ru a ilust ra temperatura camere i.
apei sa se ridice pe pai in sus.
Duceti-va termometrul afar a.
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PAMANTUL NOSTRU NEOBO SIT
azel nii
L
una este eel mai apropiat
vecin
din
spatiu
al Pamantului. Stirn mai
multe
despre Luna
decat
despre
orice
alt
corp
ceresc
deoarece astronautii au aterizat
pe ea ?i i-au explorat suprafata. Luna
este singurul satelit al Pamantului. Ea
mascara 3.476 km
in diametru
- avand
aproximativ un
sfert
din marimea
Pamantului. Se invarre in
jurul
Pamantului
la
0 distanta de
aproape
385 000 km ?i face calatoria
aproximativ 0 data pe luna. Luna nu
emite niciun fel de lumina proprie 0
vedem pentru ca rerlccta lumina
de
la
Soare. Lumina solara Iurnineaza diferite parti ale Lunii
pe masura
ce
luna trece
prin ea.
Din
aceasta cauza Luna
pare
ca-si
schimba forma
. Luna se
rotcste incet in timp
ce inconjoara Pamantul astfel ca aceeasi parte a sa este
intoarsa
tot
timpul spre
Pamant.
Vedem Luna Iuminata complet doar 0 data pe luna dar
nu trebuie sa asteptati 0 luna spre a vedea schimbarile
formei
sau ale fazelor sale. Proiectul acesta va va ilustra
in doar
cateva
minute cum trece
Luna
prin
fazele sale.
Creatl-va propria voastra una
VETI AVEA
NEVOIE
DE :
minge de fotbal sau volei, lipici,
pensula de lipit, st lcla, foita sau
fol ie de staniol, foarfeca, adeziv
refolosibil, lanterna .
f .
.....
1
ASigUrat i.va ca mingea e spalata
uscata complet inain te sa 0 tolosltl
l ntindeti lipiciul pe toata suprafata mingli,
Asezati-o pe
0
sticla sau ceva
sernanato r,
pentru a 0 mentine nemiscata .
Fata Lunii
Aceasta imagine lnfati$eaza 0
priveliste a Lunii vazuta de pe
Parnant, ano lntreaga Luna este
luminata, a$a eum apa re aic i, 0
numim Luna plina. Regiunil e mai
Intunecate ale suprafetei sale
sunt
campi: lntinse de praf, numite marl
Zonele mai luminoase sunt muntii.
Acestia sunt presarati cu eratere ce
au uneori diam etre de sute de
kilometri. Muntii de pe Luna au ma
bine de 6
.000
de metri l nattime.
2
Taiati atent hartia sau folia de stan
In patrate mar io lnveliti mmgea In fo
de staniol. Incercat: sa
tacett
supratata
cat mai neteda posibil. Acum aveti prop
voastra Luna
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12
F Z ELE LU N
Luna pe rnasa. Fixati
un mic ghern de adeziv refolosibil
sub rninge. Acesta va t ine in loc
va imp iedica sa se rostogoleasca de pe
masa .
recerea prin
faze
Cand va aflati in parte a opusa priete
nului vostru, zona mingii care da spre
voi reprezinta Intunericul. lata ce se
intarnpla data pe luna pe cerul noptil,
Putem vedea doar fasie subtire de
lumin a, pe care numim Luna noua
sau serniluna. Pe masura ce va miscati
in j urul mese i, portiun e mai mare din
minge este luminata de lanterna, Toata
va f i luminata cand va veti af la in
spatele prietenului vostru. Cand acest
lucru se intampla cu adevarata Luna,
numim Luna piina. Miscandu-va In jur,
mingea cade
trept
at In intuneric. Cand
va aflati iar in partea opusa prietenului
vostru , veti vedea iar Luna noua.
4
puneti-va un prieten sa stea la un
capat al mesei pentru a trimite cu
lanterna raza puternica de lumina
asupra Lunii voastre. Mergeti de partea
opusa a mesei. Priviti-va Luna dupa ce ati
stins toate celelalte lumini din camera.
Luna noua semiluna)
5
Treptat. miscati-va in jurul mesei,
uitandu-va inca la Luna voastra. Veti
vedea formele diferite pe care Ie ia.
Aceste forme sunt fazele Lunii.
faza prim ului patra
Luna plina
faza ultimulu i
patrar
Luna noua
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P M NTUL NOSTRU NEOBOSIT
Fluxul refluxul
Vecinul apropiat
Luna este un desert sterp de piatra . Nu
are nicio atmosfera care s-o protejeze
de razele periculoase ale Soarelui ,
niciun fel de apa care sa susti na viata.
Forma Lunii pare sa se schimbe in
decursul unei luni. Numim aceste
schlrnba rl ale formei sale fazele Lunii.
Luna are nevoie de 29 de zile si
jumatate
pentru a se modifica de la
0
serniluna subtire ultimul patrar) la un
cerc plin apoi iar la ult imul patrar,
um
p r
mareele
Luna
orbita
Mareele se ridica dedes
ubtu
l Lunii pe
masura ce Parnantul se roteste.
Gravitatia Lunii rldica apa oceanelor,
at ragand-o spre ea.
4
P
amantul e albastru cand e privit
din intunericul
spatiului cosmic. Aceste
lucru
se datoreaza faptului ca
70 din suprafata lui e accperita de oceane. Ele ocu
pa
peste un milion de milioane de milioane de tone de apa.
La fiecare 12 ore, apa marii se ridica, iar apoi coboara.
Aceste ridicari coborari sunt
numite
maree flux
reflux). Cand apa se ridica, spunem ca
este flux
. Cand ea
se retrage,
spunem
ca este reflux. Miscarea apelor
oceanice
este determinata de Luna de rotatia
Pamantului. Forta de gravitatie a Pamantului atrage Luna.
Pe masura ce Pamantul se roteste, Luna atrage ea apa
oceanica, facand-o sa se ridice.
0
ridicare asemanatoare a
nivelului marii apare de
partea opusa
a Pamantului,
unde
apa creste, ca rezultat al miscarii de rotatie a Pamantului.
In aceste locuri e flux. Sase
ore
mai tarziu,
Pamantul
s-a
rotit cu 90. Marea se retrage apoi in puncrul sau eel mai
scazut, arunci apare refluxul.
Cele doua
experimente opuse
explica
cresterea
descresterea nivelului
oceanelor
tara nicio
schimbare
a
cantitatii de apa marina, felul in
care
revarsarile mareic
de apa
raman
in acelasi loc dedesubtul Lunii,
pe
rnasura
ce Pamantul se roteste sub ea.
o data la doua saptarnanl, Soarele
Luna se allnlaza cu Pamantul. orta lor
de atra ctle cornbinata creeaza 0 maree
de sizigil ,
0
maree mai lnalta decat de
obicei.
o saptamana mai tarziu, Soarele
Luna se afla la unghiuri drepte unul
fata de alt ul. Orientandu-se in directii
opuse, ele produ c
0 mar
ee mai joasa
decat de obicei, num lta maree moart
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F
LUXUL
R EFL U XUL
luxul
refluxul
l
cas tronu pe su prafata fixa ,
nete da, apoi urnp leti-l pe jumatate cu
apa . Puneti user mingea In apa, astfe l
incat sa pluteasca in mijlocul castronului,
dupa cum va ilustreaza
imag
inea .
ambele maini deasupra
mingii Irnpinget i-o cu grija In a pa.
dar
ferm . Priviti ce se intarnpl a cu nive lul
apei. Se ridica lntr-un flux .
Revarsarea mareei
3
l.asati mingea sa se rid ice iar user,
Puteti
vedea acum apa din castron
scazand. Astfel ma reea s-a ridicat > i s-a
retras, desi cant itatea de apa a rarnas tot
tim
pul nesch
imb
ata .
VETI AVEA
NEVOIE
DE :
Flux reflux: un llghean de
plastic , apa, minge de plastic
pentru a reprezenta planeta.
Revarsarea mareei: lipici tare,
0
sfoara subtire cu lungimea de 20
em $i
ooua bucau de stoara de 40
em, minge de plastic pentru a
reprezenta planeta, lighean de
plastic, perforator, apa.
l
LiPit i foarte bine sfoara lunga de 2
em de minge lasati -o sa se usuce.
Intre t imp, cere ti-i unui adult sa va
perforeze doua gaurt la marginea
ligheanului, una de fiecare
part
e.
2
Trecei i
cate
un fir de
stoara
lung de
4 em prin fiecare
gaura iegati
sfoara de marginea ligheanului. Umpleii
pe jurn atate ligheanul de p
last
ic cu apa
lasati mingea sa pluteasc a in apa.
3
RUgat i un prieten sa traga de sfo ara
Iiplta de minge spre el sau ea. Exista
mai rnulta
apa Intr-o parte a mingii decat
in cealalta, A
ceast
a este revars area
mareei.
4
Luna atrage apa, dar Pamantul face
acelasi lucru. Acum cereti-i pr ietenului
sa i ina mingea pe loc In
timp
ce arnandol
tragef
sforile legate de llghean pana
schimba forma.
5
Acum exista reva rsare a ma reei de
ambele parti ale p lanetei. Unul d in voi
sa intoarca mlngea user. Putei i observa
cum reva r
sa r
ile mare ice se misca In j urul
planetei pe rnasura ce ea se lntoarce.
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P AMANT
UL NOSTR
U NEO OSIT
... Mari puternice
Pe vreme rea, valuri uriase se ina
ta
se sparg , tras torrnand marea
lntr-o
rnasa turnultoasa.
Valuri curenti oceanici
M
area
este
rareori calma. Chi
ar
intr-o zi llnistita, vet
obser
va valurele pe suprafata ei. Valurile se misca
p
suprafata oceanului. Ele sunt purtate mai ales de vant, Cu
cat sunt
mai
puternice
vanturile mai lunga
distanta
pe
care
au strabatut-o,
cu
atat
sunt
mai mari mai inalte
valurile. Valurile afecteaza de obicei
num
ai su
prafata
apei.
Pe rnasura ce ele circula,
valul se apropie de d
apa
insas! nu se
rnisca,
Ea doar se ridica
coboara cand valul
trece
prin
ea. La nivelul
profund alunor oceane
,
dop ul lsl mentine poz
apa
se misca 'in suvoaie
uriase,
numite
curenti, Acestia
pot
fi calzi sau reci ,
p
ot
af
ect
a clima lumii. Curentii oceanici
sunt
deterrninati mai
degraba
de diferentele de salinitate
sau de temperatura ale apei decat
de
vant.
valul circu la,
r opu l nu
Primul
proiect
ilustreaza cum se crecaza valurile, iar
al doilea
cum
sunt
provocati
curcntii
de
bataia
vantului. Curcntii cum
sunt
cei
din
al treilea proi
ect
se
produc
pe
0 scad
mult
mai
mare
n cele mai intinse
...Trecerea valului
oceane ale lumii.
Diagramele de mai sus ilustreaza trecer
valului pe suprafata apei, in
timp
ce obie
te le de pe apa ab ia daca se misca putin
Crearea valurilor
VETI AVEA NE VO IE DE:
lighean dreptunghiular de plastic ,
cana , apa, cada sau bazin
gonflabil cu apa put in adanca ,
plasti lina,
l
A ezat ligheanul pe podea sau pe
0
2
Suf,ati foarte user peste suprafata a
rnasa. Alegeti un loc unde nu Vefi vedea ca apa Incepe sa se valu-
contea za daca se sc urge put ina apa. reasca acolo unde suttati, Tot asa se
Umpleti ligheanul cu apa pana cane forrneaza valurile oceanice prin rnlscare
ajunge aproape la margine. aerului, deci cane bate vantu l.
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