Looking at Oil and Water refracting a pencil

 Looking at Oil and Water refracting a pencil and getting the students to work out the refractive indices. #iteachphysics

Vortex Mixer with food tests

I discovered that using the vortex mixer in doing food tests made a terrific difference, getting the food to dissolve in water to get much better test results.
 

Bernoulli Principle

 Blowing down the funnel holds the ping pong ball in the neck of the funnel - counter intuitive 

Magnetic fields and wires

Using a plotting compass to detect the magnetic field around a wire. Many of the students think this is some sort of trick then we looked at the problems with mains and computer cables and interference

 

Flying Cake tins

 A demonstration of Electrostatic charges repelling like charges caused by a Van de Graaff Generator. This causes the aluminium cake tins to fly away from each other and from the van de Graaff generator.

Ionic Bonds

Ionic bonds with dot and cross diagrams are hard to visualise. Using these card models made with a Scan n cut machine, the students seem to grasp the idea better. The real problem is to sort out a better Sulfate and Nitrate groups.

Lego EV3 to determine acceleration due to gravity

We have been using this Lego technics setup to determine the acceleration due to gravity and getting 9.8 m/s/s consistently. The students had to do the programming themselves from the formula which made it a bit harder.