Question

To test how different surfaces affect friction, a student placed a block of wood on a glass surface and a block of glass on a wooden surface. The two blocks were identical in weight and dimensions. He then arranged the setup as shown in the image. Very carefully, he added 10 g weights to the two pans at the end of each rope and observed the results. What could be a source of error in this experiment?

A) Smaller masses should have been added to the pan for more accurate results.
B) The blocks are not variables and should be identical in structure and composition.
C) Glass is not an ideal material for the block as it has a very low coefficient of friction. D) Friction depends on the weight of the object, so the blocks should have different weights.

Answer 1

The blocks are not variables and should be identical in structure and composition.

Step-by-step explanation: