(Solved) How do I work out static coefficient of friction?

In my experiment I have a steel block with variable weights added 100g, 300g, and 500g at different stages of the experiment. This block is attatched to a weight table where masses are added until it causes the steel block to move across the surface. The surface is copper for one experiment and aluminum for another.

The steel block weights 1050g

Here are my results, I need to work out the coeffient of friction for each.

Copper Surface

100g weight added to steel block - copper surface - 2.52 Newtons to move it
300g weight added to steel block (removing origional 100g) - copper surface - 2.52 Newtons to move it
500g weight added to steel block (removing previous weights) - copper surface - 3.34 Newtons to move it

Aluminium Surface

100g weight added to steel block - aluminium surface - 2.82 Newtons to move it
300g weight added to steel block (removing origional 100g) - aluminium surface - 3.51 Newtons to move it
500g weight added to steel block (removing previous weights) - aluminium surface - 4.25 Newtons to move it

I think its the static coefficient of friction I need to work out for each.

Please help me work out how to do it. Thanks

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How do I work out static coefficient of friction?

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