Using this block, a student wants to test a hypothesis that frictional forces are independent of the area of contact between the block and the surface it slides on. Which method is BEST to collect the data needed? D- Pulling the block across the same surface 10 times, adding a weight on top of the block each time.
A- Pulling the block across 10 different surfaces with the largest side in contact with them.
B- Pulling the block across the same surface with a different side in contact each time.
C- Pulling the block across three different surfaces with a different side in contact with each surface