1. Objects all fall at the same speed (if there is no air resistance).
This is a great video showing a bowling ball falling at the same rate as a feather.
2. Music Waves
This video shows sound waves in different media – very cool video and students are often quite mesmerized.
CYMATICS: Science Vs. Music – Nigel Stanford from Nigel Stanford on Vimeo.
3. Wave-Particle duality of Light
This video is a high quality video that recreates Young’s double slit experiment that shows light has properties of a wave and a particle.