Fun Engineering Activities to Do at Home
#1. How to Peel a Raw Egg!
Once 36-48 hours have passed, carefully remove the egg from the jar and you will see that the shell has disappeared and your are left with a delicate but intact egg!
An egg shell is made up of calcium carbonate which is an alkaline, while the vinegar is an acid. Acid reacts with alkaline to produce salt and carbon dioxide.
As soon as you cover the egg with the vinegar you will notice little bubbles of carbon dioxide forming. During the time the egg is in the jar, the shell dissolves leaving you with a delicate see through membrane keeping the egg intact.
If you shine a light near the egg you should be able to see the light through it.
#2. Hex Allen’s Night Light
For this project you will need:
- Clear jar with a lid
- Adhesive tape
- Sheet of white paper
- 3 x 3volt coin-shaped batteries
- 3 x small LED light bulbs with prongs or a string of LED lights
How to make your Hex Allen nightlight:
- Place the prongs of one LED bulb on either side of a battery. Make sure the longer prong is in contact with the plus side
- Hold the prongs tightly against the battery and it should light up
- Tape the prongs in place so the light stays on and repeat for the other bulbs/batteries
- Tape your battery/bulb combos inside your jar. You could tape one to the underside of the lid and one on the bottom of the jar and one along the side
- Place your paper around the jar and cut a piece to size so that it completely covers the clear surface of the jar
- Tape it in place
- Turn off the lights and you will have a night light ready to use.
The white paper spreads the light and makes it stand out better. You can also draw a design on your paper or experiment with different types of materials to see which one best spreads the light.
#3. Make a CD Hovercraft
How to make a CD hovercraft:
- Make a small cone shape with the card. The biro lid should be flush with the top of the cone when placed inside, and the bottom of the cone should be slightly larger than the hole in the centre of the CD.
- Without covering the hole in the biro lid, affix it to the top of the cone using adhesive tape.
- Place the CD shiny side up on the table.
- Place your cone construction over the centre of the CD and form an airtight seal between the bottom of the cone and the hole in the centre of the CD using adhesive tape.
- Fix the balloon over the top of the cone and hold it in place
- Move your CD around on a hard, flat surface and watch as the movement inflates the balloon!