Investigate effect of angle, media
http://www.physicsclassroom.com/Physics-Interactives/Refraction-and-Lenses/Refraction
Investigate effect of angle, media
http://www.physicsclassroom.com/Physics-Interactives/Refraction-and-Lenses/Refraction
Add different colours, explore uploaded image
http://www.physicsclassroom.com/Physics-Interactives/Light-and-Color/RGB-Color-Addition
Change uniform colors and see effect
http://www.physicsclassroom.com/Physics-Interactives/Light-and-Color/Painting-with-CMY
See effect of filters
http://www.physicsclassroom.com/Physics-Interactives/Light-and-Color/Color-Filters
Explore value of g on other planets
Find your weight
Effect of friction, air resistance, force on motion of sled
http://www.physicsclassroom.com/Physics-Interactives/Newtons-Laws/Rocket-Sledder
Play with densities, see forces
https://phet.colorado.edu/sims/density-and-buoyancy/buoyancy_en.html