Marcus set up the experiment as shown below. He tied each identical wooden block to a small container. Next, he placed the wooden blocks on four different surfaces labelled M, N, P and Q.

Marcus added 10g-weight one by one into each container until the wooden block attached started to slide across the surface. He recorded the results in the table below.

SurfaceNumber of 10g-weights required for blocks to start sliding

Based on the information above, which one of the following statement(s) is/are correct?

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