Circles on water Animation Play

Circular, spherical and plane waves Student activity Play

Democritus's atomic theory Animation Play

Different magnitudes of forces Animation Play

Diffraction and interference of mechanical waves Whiteboard presentation Play

Diffraction and interference of mechanical waves Class activity Play

Diffraction and interference of mechanical waves Whiteboard presentation Play

Diffraction and interference of mechanical waves Class activity Play

Early atomic theories Student activity Play

Earthquake Whiteboard exercise Play

Earthquake Student activity Play

Earthquake Animation Play

Electromagnetic waves Student activity Play

Electromagnetic waves Whiteboard exercise Play

Energy as an essential factor in muscle contraction Student activity Play

Energy conversions Whiteboard presentation Play

Energy conversions Class activity Play

Energy transformation in the muscles Whiteboard exercise Play

Erythrocytes – red discs Whiteboard exercise Play

Force resulting from mechanical interaction Animation Play

Force – what is it? Student activity Play

How do cells transfer energy? Student activity Play

How flypaper traps work Animation Play

Increase in energy Animation Play

Increase in energy Whiteboard exercise Play