how to make a water ballon launcher for a child?
540359
well,first of all you can take a hollow cylinder.then on one end of the cylinder,attach a rubber sheet(thin one).then you can attach a stick with flat head  fixed to it to the rubber sheet.the flat head will prevent the balloon from bursting in the cylinder.now to make it work,first pull the stick towards you,like a catapult,and then release it.the rubber attachment will make it go ahead and strike the water baloon.i tried it.it worked.\nif you face any problem,contact me.
1122979
water balloons. have lots of water toys.  bubble machine. have a kiddie pool, too, or water slide (if you can fit this on your budget).\n\nhave fun!
949238
u can  take rod shaped plastic pipe of different sizes & pingpong balls at sides. cover them with clay to give them shape of a bone, then use  thin elastic rubber ( which are used in rubber band, thin white in color) use many of them  as muscle fibre by attaching them to bone
706763
A sterio system and a pogo stick.. He's a kid! Make sure he's have regular kid fun too!
582408
try dish soap and water... you can just get the cheap stuff, add it to water and let them have fun
252281
a bowl of water, a cork magnet tape and a sewing needle.\n\nFill the bowl with water. Take the needle and rub it on the magnet back and fouth for a long period of time 15 min will about do it. After you are down take the sewing needle and take it to the top of the cork. Take the cork and needle combo and place the cork bottom side in the water. \n\nIf you move the bowl the needle will move.
314204
Because of the weight of the sticks, you will probably need to split them into 1/4 or 1/8 widths, wet them and curve then for the wing shape (rounded on top), and then glue them in a framework. Use tissue paper. If you make a propeller, you could power it with a wound rubber band.\n\nConstructions such as this were made by aeronautic teenagers 50 years ago, but they usually used balsa wood.
81220
So am I. Although I haven't found the exact one I'm looking for, I have been having success finding some models. Some alternate names to search are "walking moonball" "moonball" "rolling ball" "dance ball" "water ball" "roller ball" "ball coaster"\nThe following sites are where I have found a few moonballs. The last link I posted is the closest to what I'm looking for, but it's still not exactly it. Let me know where you find yours and I'll check it out. Also, I have not come up with any prices yet although I'm expecting $500 U.S.  to be the cheapest based on what else I've seen out there. Let me know what prices you come up with when you find what you're looking for.\n\nThanks, and good luck.\n           -Tim\n\nhttp://www.bizitairproducts.com/waterball.htm#\nhttp://www.china-inflatable.com/products/sports5.htm\nhttp://www.made-in-china.com/showrooms/weimei168/3/TAyMDg0OTYzM/mic/mic/mic/Inflatable_Roller_Ball_P-05.html\nhttp://www.giftsandhome.globalsources.com/gsol/I/Inflatable-play/a/9000000070247.htm\nhttp://ciaky.trustpass.alibaba.com/product/11127536/Moon_Walking_Ball.html?chkProductIds=11127536&ad84kt=y
1060572
Try oil, water and colored sand. It is not a third liquid, but it should be good enough for the kids!
37220
The best shape activity that worked for my son at this age was a shape sorter. They can picked up at any toy store or Walmart/Target/K-Mart. \n\nIt is a plastic box or ball with holes cutout in various shapes. There are plastic pieces that fit inside of each cutout. The child has to match the shape to the cutout and slide it insde the shape sorter.\n\nIt's fun and easy.....I would name the shapes as he placed them inside so eventually he learned the names of the shapes....hearing it and seeing it at the same time makes a huge difference!\n\nGood luck!
137156
Well it depends on how old they are. I would get a big ball of plasticine. I would make it big and round, and then show them how it started out spinning. Then as it spun, it spread out like a plate. Take a lump and roll it for the sun, and smash the rest flat so it is a big flat plate. Cut out a hole in the middle and place the sun in it. Then get a knife an cut it into annuli, and then roll those annuli into balls, and place them at different distances from the "sun" ball. There, you have made yourself a big spinning solar system with a sun and planets. \n\nAnd you have had fun rolling the plasticine into balls and smashing it and cutting it etc.
614264
Go to Walmart....Buy 4 or 5 of those strofoam tubes that kids play with at pools and beaches. They are hollow on the inside. Cut down the middle lieght ways and place the tubs around the edges of you kayak. Turn kayak upside down on the roof and secure it.
298250
Are you asking for suggestions of things to bring in to show kids the difference?  If so, how about bringing the following dry things:\n\nCotton ball\nVery dry dirt\nFabric (wash cloth)\nSand\nBowl\n\nAnd then apply water to each of those items.  How does water change dirt, sand, a washcloth?  How is this different from what happens when you put water in a bowl?\n\nHope this helps in some way.
1052452
make anything out of the following\nperiscope\nvolcano (Although I don't suggest this - it is a very old project and maybe many will turn up using this)\nA mini hovercraft or hot air baloon (info can be found on net)\nI don't know what it is called but if you know that thing in which we have to take a small hoop across a wire (which is not straight) without touching it. If touched, it will make a sound.\n\nIf none of this suits you, you might watch Backyard Science at National Geographic Channel
285919
You will need the following materials: \n\n• balloons \n• long wooden or metal skewers \n• petroleum jelly \n• a sharp pin \n• cellophane tape \n\nBlow up a balloon – not too full – and tie the opening shut. Dip the tip of a skewer in Vaseline and spread the Vaseline along the entire length of the skewer. If you are careful, you should be able to push the skewer all the way through the balloon without popping it. Insert the skewer with a gentle twisting motion into the end of the balloon opposite the knot. Continue pushing and twisting the skewer until the tip emerges from the other end, near the knot. Why doesn't the balloon pop? \n\nNow try to stick the skewer into the side of the balloon.What happens?\n\nThe rubber in the balloon consists of many long molecules that are linked together. It's similar to the way all of the noodles in a plate of spaghetti stick together. These long molecules are called polymers; when molecules of a polymer are chemically attached to each other, it is called cross-linking. These links hold the polymer molecules together and allow them to stretch…up to a point. When the force or tension pulling on the cross-links is too great, they will break, and the polymer will pull apart. \n\nLook at the rubber near the ends of the balloon where you first inserted the skewer. Does it look lighter or darker than the rubber in the rest of the balloon? \n\nThe rubber at the ends of the balloon is stretched out less than in the middle of the balloon. Therefore, there is less force pulling on it. This allows the tip of the skewer to break some polymer cross-links, push aside the molecules of rubber, and slide into the balloon. However, enough cross-links remain so that the balloon holds together.\n\n\nIn the side of the balloon, there are fewer polymer molecules. When you push the tip of the skewer through the rubber in the side of the balloon and the skewer breaks a few of the cross-links, the tension on the remaining cross-links is too great, and the balloon pops. \n\nDo you think there is a way to stick a sharp pin through the side of a balloon without popping it? \n\nPut a small piece of cellophane tape on the side of the balloon and press it down well. Now take the pin and press it through the tape and into the balloon. Does the balloon pop? \n\nThe tape sticks to the rubber in the balloon and will not allow the rubber to stretch to the breaking point when the pin pierces the balloon. In other words, the tape reinforces the cross links, and the balloon stays together.
963460
Sounds like you already have some fantastic ideas!  I personally like the soda can and chocolate bar method.  I have to admit, I'd never heard of it until you mentioned it.  Now, I look forward to trying it.\n\nDon't forget flint.  That's an effective and popular method.\nYou don't necessarily need the 9-Volt battery with steel wool, I've seen it done with flashlight batteries.\nYou can still do the condom and water, just use a clear balloon (if you can find one).\n\nI'd stay away from chemicals for that age group.\n\nHere are some links for you to take a look at...\n\nhttp://www.onagocag.com/fire.html\nhttp://members.cox.net/bsatroop218/skills/nomatch/nomatch.html\nhttp://www.christianhomekeeper.com/fire.html\nhttp://www.fieldandstream.com/fieldstream/outdoorskills/article/0,13199,1149562,00.html\nhttp://www.alpharubicon.com/primitive/firewithout.htm\nhttp://www.bizarrelabs.com/firebow.htm
494133
some good projects for kids are at-http://pbskids.org/zoom/activities/sci/\nthese might be too easy for anyone older than a 3rd grader, but they're still something!\n my little brother is doing the water filter.  he's going to see which of the materials filters water best. good luck! :)