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HELP Required on Science Demos!

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EEVblog:
I've been roped into giving a 1hr online science demo to a bunch of 10-11yo's about forces, energy and electricity next Thursday :scared:

This is an early guideline.



Haven't really though about it yet, and don't know what electricity component they want yet.

My first thought was a demo of a neodymium magnet down a copper pipe to show how it slows down. This demonstrates gravity, magnetism and electricy all in one.

Another though as the 2-G tipover effect in crystals, and a demo of how tipping a crystal oscillator over applies gravitational force to the crystal and changes the frequency. Easy demo I've done before.

The other more physics type stuff  :-//

I had a fleeting thought about using my thermal camera to somehow show a temperature change when I apply a force (like squeezing?) to somthing?

Maybe a demo of electrostatic force pushing something?
Bending water with electrostatics?

Any ideas appreciated!
Obviously they have to be realtively simple and effective, and doable by next thursday.
Thanks.

EEVblog:
Turns out it's a multi part series!
Forces, then transformation of energy, then electricity.
So the one next week is just forces as per the sylabus.

antenna:

--- Quote from: EEVblog on September 29, 2021, 05:07:07 am ----thermal camera to somehow show a temperature change when I apply a force (like squeezing?) to somthing?
-electricity, gravity
-Maybe a demo of electrostatic force pushing something?

--- End quote ---
-Rubber bands get hot when stretched and cool when relaxed.
-Kelvin Water Dropper?
-Electroscope(like a Kearny Fallout Meter)?

For a non-contact force, it would be cool to find a radiometer and a laser by next thursday.

daqq:
An improvised single stage/multistage coilgun is something the kids might enjoy? Have the 'projectile' hit a light object then a heavy object and measure how far the other object travels? Play around with the voltage/energy in the capacitor? Don't overdo it though, people like their eyes ;)

You will demonstrate how by means of magnetism and inductors electrical energy is transformed into kinetic energy and movement and how the same amount of energy will have a different effect on an object depending on its mass.

jpanhalt:
Transformers and turns ratios.

Buoyancy in air -- large, thin trash/dry cleaning bags filled with hot air and/or whatever you can find.

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