We did a physics lab investigating the coefficient of friction for a horizontal

Question

We did a physics lab investigating the coefficient of friction for a horizontal surface. The lab was to calculate the coefficient of friction on different surfaces by pulling a block across a flat surface at a constant speed. We pulled the block of wood over a surface made of cork, sandpaper, rubber and cardboard.
The surface that appeared to have the greatest coefficient of friction seemed to by the rubber.
Why is this?

Also, why is the applied force always equal to the frictional force. Why is the normal force equal to the weight?

Explanation / Answer

for your first question a)the coefficient of friction seemed highest for rubber because rubber grabs the uneven (at microscopic level) surface of the blocks.thus causing it difficult to move this is the reason why most of the tyres are made of rubber so as to prevent vehicle from slipping b).the applied force always equal to the frictional force. also the normal force equal to the weight because for every action thereis an equal and opposite reaction the third law of newton

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