Do repeat the experiment with 1., but changed from dragging on the floor, smooth as a drag on the sandpaper and then save the results from the observation that occurs from an experiment to save the results of the experiment.
The experiment was repeated with Article 1. But the transition from dragging on the ground as a drag on the paper. Then save the results of observations arising from the trial record results in the table.
experiment was repeated with the 1. But the drag on a flat surface is a drag on sandpaper. Record the observations resulting from the experiments into table record the results of the experiment.