It doesn't matter what anyone thinks, that is what you found. Assuming you did at least three trials for each surface and the variance (difference from one trial to the rest of the trials on the same surface) was such that the different trials did not overlap data from trials on the other surfaces, you had a conclusive result.anuami wrote:Do you think that would be true?
Yes/No/Maybe. Definitely DIFFERENT because you would be testing a different set of material pairs (assuming your tires are a different material than the marble you plan to use) and the marble doesn't have an axel and associated frictional component. Even without an axel frictional component, the marble could easily be partially sliding on some surfaces. For really hard surfaces (ones where the weigh of the marble does not cause enough pressure to deform the surface it is resting/rolling on), the marble must be partially sliding to experience any significant friction. For really soft surfaces that easily deform, the "friction" you calculate will be dominated by the energy utilized to deform the surface and the sliding friction will be insignificant.anuami wrote:Would the results be more accurate if we test it with a marble than a toy car?
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