A hovercraft is also called ACV (Air Cushion Vehicle). It uses blower to create air current beneath itself to create air cushion that slightly lift it up and reduce the friction with surface so it can move freely to any direction in which it is pushed.
We will Build a model of hovercraft that uses same principle out of home materials.
- CD or DVD Disc
- Cap of plastic bottle
- Glue gun
- Make a small hole in center of the plastic bottle’s cap with pen knife or drill.
- Cover the center hole of the disc with Cap (that you made in step 1) by putting it on top of disc and apply glue to make air tight contact but don’t apply glue on the hole of the cap.
- Blow up the balloon and pinch it shut and than fit mouth of balloon over the cap and release it.
Your hovercraft is ready and working. Put it on smooth surface and Push it in any direction it will go there smoothly.
Air from balloon passes through the hole in cap than flows beneath the disc creating air cushion that slightly lift the disc up and reduces friction between surface and disc so it is free to move and can go in any direction where it is pushed.
- Use large size balloon
- Make two more holes in the disc and cover each hole with cap than blow three balloons and fit them to caps (This is easy with three people each handling one balloon)
- Try to land your hovercraft on water and sand
- Check how much weight (pencil, rubber, paper clips) your hovercraft can lift.
- Think! What can you do to increase the payload capacity of your hovercraft.
In ancient time before the invention of metal and clay pots. Humans had been boiling water in large cup shaped leaves. We know this is old method of boiling water but for fun and learning how it works we will boil water in a bag made out of paper.
- Make a simple cup shaped paper bag. Keep the bottom area of the bag larger than the area of the fire of your gas stove
- Put your bag on stove and pour some water in it. Start fire gently and keep its flame level lower than the corner and sides of your bag. Otherwise sides of your bag may burnout. Wait until water starts to boil. If you have house hold thermometer use it to check water temperature.
Paper has ability to absorb water when you pour water in your paper bag, it absorbs some water which prevents it from burning and fire keeps the paper dry. In this way water that becomes hot goes to surface and cold water takes its place. This process continues as long as your bag has water.
It is an ideal home experiment and science fair project in which you will learn how lava is ejected through a mountain and about the chemical reaction of vinegar and baking soda. We will use kitchen materials to build a model of volcano that will look like a lava erupting mountain.
empty plastic bottle
clay or wheat flour
card board sheet
- Place the card board sheet on clean surface and put the empty plastic bottle on center of the sheet.
- Use wet clay or wet wheat flour to cover the plastic bottle and make rough mountain like structure around it. Be careful clay/wheat flour should not be dropped inside the bottle and also don’t cover the opening of the bottle. Dry your structure in sunlight until it is hard to break.
- Add 2 to 3 spoonful of baking soda and 4 drops of red food coloring in the bottle that you have covered with clay/wheat flour.
Your Volcano is ready for eruption. Take your model where you want to perform it than add some vinegar in the bottle to start the volcano. You will see fountain of foamy liquid coming out it.
When baking soda (sodium bicarbonate) and vinegar (acetic acid) are mixed they react with each other and produce gas bubbles that builds enough pressure to force the foamy liquid out from the bottle.
- Use different quantities of baking soda and vinegar with different colors.
- Use three bottle in the place of one with three different colors (Red, Green, Blue).
- Use glowing ink or powder with food coloring.