Working of a manual traffic signal
by Gokulraj
(Qudaibiya,manama,Bahrain)
Materials needed:
1) A Piece of Square Cardboard
2)12 Miniature Sockets
3)12 Miniature Bulbs (3.5V)
4) Some screws
5)2 Colors of Wires (5M each or as much as the requirement)
6) A cutter
7) Water Paint
8) Double side stickers
9) A battery or an adapter (9V)
10)4 Wood pieces like the traffic signals
11)1 small piece of card board.
Working:
Step 1: first take the piece of cardboard. Then take the Double side stickers on the back of it. Then stick these three sockets on each wood piece like the traffic signals.
Step 2: Then fix those wood pieces on the cardboard on 4 sides with the help of the screws, like place the wood pieces on the card board then screw it from down of the cardboard. Then fix the bulbs in the sockets. Paint the bulbs with the water paint with the colors like the traffic signals in order on all the 4 sides.
Step 3: Take wire of 1 color and then connect the negative terminals of all the sockets on all the 4 sides with the wire. Then take the small piece of cardboard and fix the screws in 3 columns and 4 rows and name it. Then take another color of wire and connect each positive terminal to each screw. Then connect the negative terminal of the sockets directly to the adapter or battery. But for the positive terminal, you have to connect 4 small pieces of wire to the positive terminal of the battery or adapter.so when you touch the screw with the positive wire it forms a complete circuit and the led glows. For working it like a traffic signal you have to touch each piece of small wire to one screw in each row. So when you do it in an order you see it working like a traffic signal.
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Which is Densor colored water, honey, or cooking oil?
by Demekeyana Hart
(Copperas Cove,Tx, USA)
modeling clay
drinking straws
jelly jars
liquids to test
scissors
Cut three equal lengths of drinking straw 2 inches long. Take a small ball of modeling clay.
Attach the clay to the end of the of one straw. Place it in a jar of water to see how deep it floats.
Adjust the amount of clay so about one third of the straw floats above the surface.
Make two more clay balls the same size and weight. Attach them to the other straws. Prepare test liquids such as water, honey, and cooking oil.
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TO PRODUCE HYDROGEN & NaOH SOLUTION
by MIKKU THOMAS JOHN
(INDIA,KERALA,THALAVADY)
Materials need
1 a transparant glass
2 Two welding electrode
3 two wires
4 salt NaCl
5 insulation tape
6 battery 9volt
7 water
INSTRUCTIONS : First you have to take the transperant glass put some salt into into it now pour some water into the glass and stir it well. Second take the welding electrodes you can get the elecrode from any industrial shop take the two wires then take the tip of the electrode stick the wire with insulation tape tightly
on two electrodes then take the 9volt battery and fix the ends of the wires to the to the battery's plus & minus ends
now put the electrodes into the salt solution connect the wires to the 9volt battery now observe that hydrogen gas &
sodium hydroxide is comming out like carbondioxide .
thank you
ADULT SUPERVISION IS NEEDED FOR THIS EXPERIMENT
if the hydrogen gas & NaOH is not produced please do not put the wires in to electrical plug point
be safe the more u learn the more u grow
by
MIKKU THOMAS JOHN STD : 8
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Crackless Egg
by May
(Fort Lauderdale, FL)
remove an egg without cracking it. materials: small self-sealing plastic bag 1 uncooked egg 16-fluid ounce bottle of white vinegar 1 glass procedure:place the egg in the bag and add enough vinegar to completely cover the egg, or enough ti fill the bag about half full. hold the bag and closely look at the egg's shell. the bubbles you see on it are carbon dioxide gas, just like the bubbles are in a soft drink. this gas is given off as the vinegar reacts with the shell. turn the bag so that the egg is in one corner, and slip this part of the bag into a glass. this will keep the egg underneath the vinegar even when you aren't holding the bag. let the egg sit overnight. then lift the bagout of the glass and gently squeeze the egg
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magnet experiment
by Mike
(WA)
Get two neobyum magnets. Get one plastic pipe and one aluminum pipe of the same length and the same diameter, a bit larger than the size of the magnets, so the magnets can fall through. While keeping the pipes in the vertical position, drop one magnet through each pipe. You will notice that the magnet in the plastic pipe falls faster than the one in the aluminum pipe. The explanation is that a changing magnetic field produces eddy currents in the conductor. Thus, the magnet's fall is cushioned by the work it has to do to create these currents.
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Resting on Water Salty Experiment
by Linda
(AZ)
Resting on Water Salty Experiment : waht are the seeds for, it doesn't say
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Water as fuel
by S.V.
(India)
water as a fuel 1.Dig the soil for about 3-4 centimetres 2.keep a small piece of cyanide rock in the hole and enclose it. 3.pour some water on the area where you kept the cyanide rock. 4.Then fire, it will burn. 5.As you pour water,the flame increases. The flame is due to the cyanide,but not due to water. Take care as cyanide is poisonous.
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Moth Ball Dance
by Emma
(Australia)
My 8 year old is going to do the Moth Ball Dance at a school talk next week. We have done something similar but with frozen choclate dots and lemonade (great for party drinks!) Moth balls work because of the rough surface, so why does it work for frozen chocolate dots?
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Shrink an Egg
by Brejian
(Lauderdale Lakes, FL)
Shrink An Egg Materials: 1Small self-sealing plastic bag clear corn syrup shell-less Egg 1 glass Fill a small self-sealing plastic bag about half full of clear corn syrup and carefully slip the shell-less egg into it. Don't be surprised that the egg floats. Take a close look at the size of the egg. Set the bag in a glass to keep the egg in the corn syrup. After a couple of hours, check the egg. Does it look bigger or smaller than it did? Leave the egg overnight before checking again. How does the size look now? Leave the egg in the syrup for three days. You should be able to tell that the egg has shrunk by now. This happened because the water inside the egg moved through the membrane into the syrup. But the corn syrup did not pass through entering, the egg. Working at at a sink, open the bag and remove the egg, gently rinsing it under running water. The membrane will now appear to be a loose sack, and you'll be able to feel the yolk thats inside the egg.
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battery from fruit
by Brett
(MT)
How to make a battery with a piece of fruit
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Dr. Pepper Volcano
by Kaleigha
(Nashville, NC)
Dr. Pepper Volcano Materials Needed: * a new bottle diet dr. pepper * regualr mentos (mint, white) * a towel (to clean up the mess) * a flat area * adult supervision Directions: Drink a little soda. Drink until you reach the wrapper. One by one, drop in the mentos. WATCH OUT! Explosion time! Have fun!
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gummy bear science project
by jacob
(florida)
you need vinagar,oil,disolved salt water,3 cups,3 green gummy bears,1 fourth measure cup,teaspoon measure,paper towels and pen and paper. first,fillsalt cup with teaspoon salt then 1 fourth water,mix then,fill another cup with 1 fourth oil,after that,fill the last cup with 1 fourth vinagar,last put a green gummy bear in each cup then let sit 24 hours and record.
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ink bills
by David
(Ghana)
Making ink balls it is the simplest but most mind buffling experiment i made just float BIC INK into a cup of ordinary water drop by drop .The ink balls settles below the water and can be filted VOILA THE LIQUID is now solid
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Do you remember if you had a bad attitude?
by Bethany Fish
(Kodiak,Ak)
Procedure-
1. I made a chart with three columns, one for negative, control, and positive attitude groups.
2. I then wrote two lists of ten words each. Each word was a four letter noun.
3. I then selected 15 people of different ages to try my experiment.
4. I gave each person the first list and a minute to memorize it. Then they got one minute to write down the words they remembered.
5. Then if they were in the negative group I tried to make them feel negative by telling them how much I hated my project, and if they were in the control group I didn’t say anything, and if they were in the positive group I tried to make them feel positive by telling them how much I love my project.
6. Then I gave them the second list of words and a minute to memorize them then a minute to write down what they remember.
7. I recorded the results.
8. Repeat the process with everyone.
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Paperclip float experiment
by Tina
(NV)
This was cool for me to see a paperclip float. What you need to do is thake a bowl of water,a paperclip,tissue paper, and a pencil with an eraser. You take the bowl of water place a piece of tissue paper on the water and gently place a paperclip on it. Make sure the tissue paper is floating with the paperclip on it. Next you take the eraser on the pencil and poke the tissue paper around the papaerclip gently enough that it sinks. When the tissue paper sinks the paperclip should still be floating. Try to make a hypothesis before you do the experiment. Trust me it will be a cool and fun experiment
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Static electrisity
by b00m!
(mv wa)
Hypothesis:
If i rub the ballon on my head more times.Then the ballon will pick up more confetti.Because the ballon has more electrical charge which will pick more confetti.
Question:
How does the amount of rubs of a ballon on my hair affect the amount of confetti it will pick up?
Materials:
-ballon
-confettie
-hair
-table
Procedure:
Step 1: Blow up the balloon
Step 2: spread the confettie on the table
Step 3: Rub the ballon on the hair once then touch the ballon to the confetti and mesure howmuch confetti it picks up
Step 4: Rub the ballon on your head 2 times and see how much it picks up now
Step 5:Rub the ballon 3 times and see if it picks up more confetti then the others.
Step 6: Record all the results
Step 7: Reapeat steps 1-6 two more times.
Reasearch:
What is static electrisity?
it is made of atoms
a charge object will also attract something that is neutral
if you charge a ballon by rubbing it on your head it picks up extra electrons and has a negitive charge in that object move
if it is a constructructor many electrons move easily to the other side far from the ballon as possible
static electrisity is made up of electrical charge in an object.
The protons are positively charged, the electrons are negatively charged, and the neutrons are neutral.
Opposite charges attract each other (negative to positive). Like charges repel each other (positive to positive or negative to negative)
Static electricity is the result of an imbalance between negative and positive charges in an object
The rubbing of certain materials against one another can transfer negative charges, or electrons
As the two come in contact, the balloon will stick because of the rule that opposites attract (positive to negative).
means the increase of electric charge on the surface of objects
Charge exchange can happen in the condition like rubbed and separated different objects
A static charge will only remain when one of the surfaces has a high resistance to electrical flow.
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Pills dissolving in different substances
by May
(Fort Lauderdale, FL)
does advil desolve faster in soda, juice, or water
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