What would be an ideal experiment to test how different types of surfaces affect friction?

Question

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1 point
Two objects of equal weight placed on two glass surfaces of equal lengths.
Two objects of equal weights placed on a glass surface and a wooden surface.
Two objects of different weights placed on two wooden surfaces of unequal lengths.
Two objects of equal weight placed on two glass surfaces of unequal lengths.

Answer 1

Two objects of equal weight dragged across surfaces made of different materials (such as glass, wood, metal, or rubber) with a force meter used to measure the frictional force. The experiment should be repeated multiple times with different surface materials and objects to ensure accuracy and consistency.