Mention the required materials in the experaiment to understand the naturea of the friction and concept of static friction
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The coefficient of friction (COF) may be adjusted upward or downward by the use of fillers [16]. Addition of low COF fillers such as graphite, hexagonal boron nitride, PTFE, paraffin wax, or molybdenum disulfide will reduce the COF. Often, only a low amount of low COF filler is needed because they are soft materials that become spread out across the polymer surface during use. In contrast, safety flooring is also made by adding fillers. Large, irregular particles of tungsten carbide are added to the PVC plastisol, which hardens to leave the particles protruding upward. This type of surface has a very high COF and is used worldwide, for example in buses, trains, and staircases to prevent slipping. Thus, hard, irregularly shaped particles are favored for achieving high COF.