Reflection of plane waves Student activity Play

Refraction Class activity Play

Relationship between the force of friction and the roughness of a surface Animation Play

Relationship between the force of friction and the surface area Animation Play

Renewable and non-renewable sources of energy Student activity Play

Roemer's proof Whiteboard exercise Play

Roemer's proof Student activity Play

Satellite telephones Student activity Play

Sections of a cube Whiteboard exercise Play

Sections of a cube Student activity Play

Seeing other bodies in space Student activity Play

Seismic waves Student activity Play

Seismic waves Slideshow Play

Sentences about light Whiteboard exercise Play

Shadows Student activity Play

Shadows Animation Play

Shooting stars Animation Play

Silver halides in photography Student activity Play

Solar eclipse and lunar eclipse Whiteboard exercise Play

Solar eclipse and lunar eclipse Student activity Play

Solar energy Animation Play

Solar energy Whiteboard exercise Play

Solar energy Simulation Play

Solar energy Animation Play

Solar energy Slideshow Play