3D cardboard Christmas Tree

We have some cardboard boxes collected from neighbours for craft work, and since it’s the festive season, I decided to do up a Christmas tree, inspired from this website.

I didn’t do any measurement or use any template. Simply sketched directly on the board and cut it.

Cut-out of carboard Christmas tree

I cut another template and cut it vertically half. Then, we painted the pieces!

The last part, is to put them together and decorate it. In the spirit of upcycling, we used bottle caps and breadbag tags for decoration.

Such a easy-peasy DIY project to do with kids this holiday!

Electricity experiments tutorial

Experiments on the topic of experiments can be tricky because there are just a lot of variables that can affect the brightness of bulbs.

I’ve made 3 videos for this. Results are not shown in the earlier part of the video, so students will still have to carry out the experiment to record the results.

Effect of number of bulbs, arranged in series, on brightness of the bulbs.

Effect of number of batteries, arranged in series, on brightness of the bulbs.

Effect of number of bulbs, arranged in parallel, on brightness of the bulbs.

Lesson on haze or air pollution

Demonstration set of haze/ air pollution

Creating haze in a beaker.
1. Measure and prepare aluminium foil to cover beaker.
2. Light up wooden splint and drop it into a beaker.
3. Cover with aluminium foil.
4. Place ice on it.

Possible extension:
Use white paper towel to wipe the inner surface. Students will be able to observe very fine soot

Possible changes, use leaves and soil as a close set-up to forest. But didn’t work too well when I tried. Leaves must be really dry to burn/catch fire.

Egg membrane paper ball

Egg membrane paper ball (my students said it looks like ping pong ball and they can toss it around.

1. Poke thru 2 holes using optical pin, one at the top and another at the bottom
2. Students chip off for a slighlty bigger hole (not too big!)

3. Remove egg content by draining it through the hoke or blowing thru it using a straw (straw need not be thru the hole, can place it just above.

4. Place egg in a beaker containing HCl. Use glass rod to ensure egg doesn’t float.

5. After 5min, discard off HCl. Place egg on petri dish. Gently tap the shell to crack it.
6. Pick up the membrane and rinse it.

7. Blow through it using straw so it inflate. Simply place the straw above the hole.
8. Roll it in talcum powder.
9. Allow it to dry.