Friction Slide Apparatus

It is very interesting to study different laws of friction with it. Comprising of a 15X60cm, wooden board with glass top hinged on an iron base to which a sector with graduated and vertical scale is provided. the plane may be clamped at any angle upto 60 degree. A  5cm frictionless pulley at one end is attached withthe help of a clamp adjusstable to any position , a scale pan with the following accessories but without edges:

1. One set of 3 wooden cariages with different bottom surface (wood, glass & iron)
2. One cariage with frictionless rollers.
3. One set of 3 different surfaces for friction board- a glass plate, a plywood & felt cloth.