Does the mass of a block of wood effect the size of a frictional force?

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Does the mass of a block of wood effect the size of a frictional force?

Preliminary experiment

First we chose a block of wood, it weighed 105g. A Newton metre was attached, which would measures the frictional force exerted on the block when dragged across a surface.

We tried doing the experiment on a smooth surface (table top), but there wasn’t enough friction for an accurate reading. Also when we tried to measure the force with just the block and only a 50 g weight attached the Newton metre did not even give a reading as there was not enough friction on the surface. We then tried carrying out the experiment on a wooden surface (an old drawing board) but again the results weren’t very clear, due to lack of friction. Finally we carried out the experiment on the floor (anti-slip vinyl flooring), the results were much clearer as there was much more friction.

Results for preliminary experiment

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Prediction

I predict that the mass of the block will have an effect on the amount of frictional force. My preliminary experiment results prove this as when we put more weight on the block the frictional force became greater. When the block is pushed down onto the surface of the floor, this causes the two surfaces to lock. A force is needed to push one surface over the other, this causes an equal and opposite reaction.  This reaction is friction.

Therefore I think that when the mass of the block is increased the friction will increase ...

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