How is light refracted in a glass of water? Animation Play

How light travels Student activity Play

How to construct a line parallel to a given line Student activity Play

How to construct a line perpendicular to a given line Animation Play

How to construct a line perpendicular to a given line Student activity Play

How to construct a perpendicular bisector Animation Play

How to construct an equilateral triangle Animation Play

How to construct an equilateral triangle Student activity Play

How to construct an isosceles triangle Student activity Play

How to construct the perpendicular bisector of a segment Student activity Play

How to construct 'Yin Yang' Animation Play

How to cross the river Student activity Play

How to cross the river Whiteboard exercise Play

How to describe a force? Student activity Play

How to describe a force? Simulation Play

How to describe a force? Whiteboard exercise Play

How to describe a force? Animation Play

How to determine position at sea Animation Play

How to draw a number line? Animation Play

How to draw a triangle symmetrical to a given point Animation Play

How to increase the moment of a force? Animation Play

How to resolve a force into components Animation Play

How to undo a wheel? Whiteboard exercise Play

How to undo a wheel? Student activity Play

How to undo a wheel? Simulation Play