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.
* Increase the weight at a small constant rate to analyse patterns and create more accurate results.
* The slope of the workbench must be straight.
Safety: There isn’t really any danger in this experiment however I will make sure my fingers are safe from the different weights.
Method:
* Put a pin in a block of wood.
* Tie a rope around the pin.
* Pull the rope with a Newton meter. Note the force needed to move the block.
* Increase this force until the block moves at a constant speed. Note this force.
* Repeat the steps three times and find an average static and sliding friction for a certain weight of the wood.
* Increase the weight by 1N and repeat.
Do this until the weight on top of the block is 10N.
Diagram:
Force
Results Table:
Weight (N)
Static Friction (N)
Sliding Friction (N)
Attempt 1
2
3
Av
Attempt 1
2
3
Av
3.5
0.7
0.7
0.8
0.73
0.6
0.6
0.6
0.6
4
0.8
1
0.9
0.9
0.7
0.9
0.7
0.77
4.5
1.1
1.1
1.1
1.1
1
1
1
1
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. The results prove my initial prediction that increasing the weight of an object will increase the force needed to move it due to the force of friction between the bottom of the wood and the table.
Evaluation: I think that the experiment went well. I followed the steps suggested in my method and kept everything fair. I believe my results were quite accurate because I repeated the method 3 times before finding an average. There were however some odd anomalies such as a surprise 1.2N sliding friction of a block with a weight of 7N. I think these anomalies were due to numerous reasons. Firstly, I believe that the laboratory was unsuitable for this experiment, because the workbenches had holes in them, graffiti and had been varnished.
Therefore, with increasing weight, the bench would become slightly adhesive and therefore it wouldn’t be friction causing a higher force to be needed to move the wood, it would be the varnish. This was visible when the weight of the wood began to exceed 8.5N and on the graph the line begins to curl upwards showing this theory.
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.
Remember! This is just a sample.
You can get a custom paper by one of our expert writers.
Get your custom essay
Helping students since 2015
Essay Writing Service Features
Our Experience
No matter how complex your assignment is, we can find the right professional for your specific task. Contact Essay is an essay writing company that hires only the smartest minds to help you with your projects. Our expertise allows us to provide students with high-quality academic writing, editing & proofreading services.
Free Features
Free revision policy
$10Free bibliography & reference
$8Free title page
$8Free formatting
$8How Our Essay Writing Service Works
First, you will need to complete an order form. It's not difficult but, in case there is anything you find not to be clear, you may always call us so that we can guide you through it. On the order form, you will need to include some basic information concerning your order: subject, topic, number of pages, etc. We also encourage our clients to upload any relevant information or sources that will help.
Complete the order form
Once we have all the information and instructions that we need, we select the most suitable writer for your assignment. While everything seems to be clear, the writer, who has complete knowledge of the subject, may need clarification from you. It is at that point that you would receive a call or email from us.
Writer’s assignment
As soon as the writer has finished, it will be delivered both to the website and to your email address so that you will not miss it. If your deadline is close at hand, we will place a call to you to make sure that you receive the paper on time.
Completing the order and download