Reflection of plane waves Student activity Play

Reflection of plane waves Animation 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 energy sources Slideshow Play

Reproduction in plants Student activity Play

Reproduction in plants Whiteboard exercise Play

Satellite telephones Student activity Play

Sections of a cube Whiteboard exercise Play

Sections of a cube Student activity Play

Sedimentary rocks. Part I Class activity Play

Sedimentary rocks. Part I Whiteboard presentation Play

Seismic waves Student activity Play

Seismic waves Slideshow Play

Shape factor Student activity Play

Shape factor Animation Play

Shooting stars Animation Play

Silver halides in photography Student activity Play

Solid substances as catalysts in reactions in the gaseous phase Animation Play

Sounds in music Class activity Play

Sounds in music Whiteboard presentation Play

Speed of light in transparent materials Illustration Play

Sphere Student activity Play

Spherical mirrors Student activity Play