For demonstration of the relationship between friction and reaction .complete with spring balance (60n) and accessories.
Inclined Plane and Friction Board
For demonstrating the composition of a force and determining the coefficients of friction between different materials. Heavy cast metal .base 450x150x25mm,hinged to wood plane comprising tow wood strips 480x60x20 mm thick,20mm apart, rigidly joined at end by metal cross pieces one strip with 51 mm extension carrying a clamp for holding pulley at any angle with aluminium pulley,44mm diameter on stem150mm long. Linear scale fixed to edge of plane and vertical linear and 0 to 45 degree angular scales screwed to metal base.