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# Investigate how increasing the weight on top of a block affects its static and sliding friction.

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Introduction

Physics Experiment Aim: To investigate how increasing the weight on top of a block affects its static and sliding friction. Prediction: I think that as the weight increases, so too will the friction. The static friction is the amount of force needed to move an object. Therefore, if pulling on a block of wood with a force of 0.3N moves the block, this is its static friction. The sliding friction is the amount of force needed to keep an object moving at a constant speed. Both of these increases if there is more weight as there will be more friction as the block pushes down to the table. Also, there will be more force needed to move the object if it is heavier. Fair Test: To keep this experiment fair, I will: * Use the same block of wood. * Work on the same workbench. * Create three results and find an average, this will make more accurate results. ...read more.

Middle

5 1.2 1.2 1.3 1.23 1.1 1.1 1 1.07 5.5 1.3 1.4 1.4 1.37 1.2 1.2 1.1 1.17 6 1.8 1.5 1.7 1.67 1.5 1.3 1.4 1.4 6.5 2 1.5 1.8 1.77 1.6 1.4 1.5 1.5 7 2.1 1.8 1.9 1.93 1.9 1.2 1.7 1.6 7.5 2.2 2 2 2.1 2.1 1.6 1.8 1.83 8 2.3 2.2 2.1 2.2 2.1 1.8 1.9 1.93 8.5 2.3 2.3 2.3 2.3 2.2 1.9 2.1 2.07 9 2.7 2.6 2.5 2.6 2.5 2.1 2.3 2.3 9.5 3 3 2.9 2.97 2.9 2.5 2.9 2.87 10 3.5 3.4 3.5 3.47 3.2 3 3.3 3.17 Conclusion: In conclusion, we can see that more weight means that more force is needed to move an object. This is seen on the graph because as we move further right (more weight) then more force is needed. The graph goes up at a slow, constant rate and then begins to curl upwards, suggesting acceleration. ...read more.

Conclusion

I also think that the method was faulty and if improved could provide us with more accurate results too. I think using a pulley instead of a Newton meter would have roduce more accurate results and also made the experiment easier and quicker. When Newton meter pulls an object, the person pulling it may be distracted or may presume a result that may not be true. It is also very difficult to read off a Newton meter. However, due to poor school funding for science, there is a lack of apparatus and therefore this may have not been possible. I think that to make sure that these results are reliable, we must cross-reference this experiment with one similar. This will create more useful evidence to fulfill the aim of our investigations. Despite this, I still believe my results provide us with reliable enough evidence for me to support both my conclusion and prediction and do show that increasing the weight of an object means that more force is needed to move it due to the force of friction. ...read more.

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