It Is extremely Interesting to think about various laws of grating with It.Comprising of a 75x15 cm. wooden board and a frictionlesspulley toward one side, a scale skillet with the accompanying accessoriesbut without weights.
1. One arrangement of three wooden carriages with various bottomsurface (Wooden, glass and/iron).
2. One carriage with frictionless rollers.
3. One of1hree diverse surfaces for contact board-aglass plate, a plywood and felt fabric.

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