What hypothesis can be put forward by observing the sliding of the bar on the table after a push?

What hypothesis can be put forward by observing the sliding of the bar on the table after a push? What experiments need to be done to test this hypothesis?

The distance traveled by the bar depends on the material from which the surface is made, the smoother the surface, the further the bar moves after the push. To confirm the hypothesis, it is necessary to carry out a number of experiments, changing the surface on which the bar slides: wood, steel, plastic.