Tuesday, November 25, 2014
Friday, November 21, 2014
Sunday, November 16, 2014
Friction Lab
Partners: Christina and Gavriella
Group 3
Objective Statement:
Our objective was to figure out the which factors affect the force of friction on a two sided block. One side of the block had felt on it while the other side had vinyl on it.
Our Plan:
Our plan was to record the force of friction of the block by adding five different weights to the block in order to control the force of gravity. yes but we were really testing how hard the surfaces press together
Prediction:
The side of the block with vinyl on it would experience a higher force of friction. what about the Fn?
Apparatus:
Procedure:
1. First we will set the Force Sensor on Logger Pro to be 10 N
2. We will lay the Force Sensor horizontally on the table and “zero” Logger Pro
3. Then we will connect the block to the Force Sensor and begin collecting data
4. As we collect data, we will hit collect on Logger Pro and drag our object at a constant velocity. why was constant velocity important?
5. We will add to the weight of the object each time to collect 5 data points.
6. We will change the Normal Force by changing the mass of the object we are using each time.
Conclusion:
In this lab, we were trying to find out the difference between the force of friction between the vinyl side and the felt side of a block in order to show their contrasting forces. To find this out, we tested both sides using a force sensor and adding different amounts of weight each time. Then we would pull the block by the force sensor so that we could measure and record the force of friction each time we tested it. The independent variable in this lab was the normal force (in Newtons). The dependent variable was the force of friction also measured in Newtons.
After doing this lab, we discovered that the slopes from our equations are the coefficients of friction. These tell you about the type of surface the object is on. We also found out from this lab that velocity and surface area do not affect the force of friction. Everyone's graph looked identical to ours: the slope of the felt side was significantly smaller than the slops of the vinyl side. The only differences were the y-intercepts and the number of the slope. Other graphs had different slopes because those other groups might have committed data error such as moving too fast or too slow. The equation for the calculation of the force of friction was Ff = μ Fn(N/N). This lab turned out exactly as we predicted: the vinyl side exhibited a larger force of friction. I feel like you didn;t talk about how the surfaces pressing harder together affects the Ff.....
Two people wearing identical shoes can have different forces of friction depending on the surface they are on. For example, a person with the same pair of shoes standing on ice will have a less force of friction, whereas the shoes of a person standing on a mountain side will exhibit a greater force of friction. Likewise, two people wearing different types of shoes will have have the same force of friction if they are on a frictionless surfaces. The coefficients of friction determine how much force of friction an object will feel. The force of gravity and the normal force does not affect this on the other hand. Yes, the normal force DOES affect the Ff,... when the surfaces press together harder, there is more force of friction.
One source of error that we had was when we measured the force of friction of the vinyl side of the block. When we were calculating our data, the block was kept riling up. This drastically affected how the block was pulled along. Another error we had was when we pulled the block. Sometimes we pulled it too fast or too slow, which messed up how we calculated the mean of the data. In the future, I am interested in finding out how tension affects the force of friction.
I feel like I am getting better at writing lab reports because they are a lot more thorough and informative. I think I can improve my writing of these reports by being more accurate.
Group 3
Objective Statement:
Our objective was to figure out the which factors affect the force of friction on a two sided block. One side of the block had felt on it while the other side had vinyl on it.
Our Plan:
Our plan was to record the force of friction of the block by adding five different weights to the block in order to control the force of gravity. yes but we were really testing how hard the surfaces press together
Prediction:
The side of the block with vinyl on it would experience a higher force of friction. what about the Fn?
Apparatus:
- Logger pro
- Weights
- Two-sided block with felt and vinyl
Procedure:
1. First we will set the Force Sensor on Logger Pro to be 10 N
2. We will lay the Force Sensor horizontally on the table and “zero” Logger Pro
3. Then we will connect the block to the Force Sensor and begin collecting data
4. As we collect data, we will hit collect on Logger Pro and drag our object at a constant velocity. why was constant velocity important?
5. We will add to the weight of the object each time to collect 5 data points.
6. We will change the Normal Force by changing the mass of the object we are using each time.
Data Collection:units!
Data Analysis:
VM: As the FN increased in Newtons, the force of friction also increased proportionally.
MM: FF = (0.229 N/N) FN - 0.1907 N
Slope: For every 1 N added, the Force of Friction increased by 0.299 N
Y-int: When the FN is 0 N, the Force of Friction is -0.1907 N
VM: As the FN increased in Newtons, the force of friction also increased proportionally.
MM: FF = (1.0591 N/N) FN - 0.3152 N
Slope: For every 1 N added, the Force of Friction increased by 1.0591 N
Y-int: When the FN is 0 N, the Force of Friction is -0.3152 N
Conclusion:
In this lab, we were trying to find out the difference between the force of friction between the vinyl side and the felt side of a block in order to show their contrasting forces. To find this out, we tested both sides using a force sensor and adding different amounts of weight each time. Then we would pull the block by the force sensor so that we could measure and record the force of friction each time we tested it. The independent variable in this lab was the normal force (in Newtons). The dependent variable was the force of friction also measured in Newtons.
After doing this lab, we discovered that the slopes from our equations are the coefficients of friction. These tell you about the type of surface the object is on. We also found out from this lab that velocity and surface area do not affect the force of friction. Everyone's graph looked identical to ours: the slope of the felt side was significantly smaller than the slops of the vinyl side. The only differences were the y-intercepts and the number of the slope. Other graphs had different slopes because those other groups might have committed data error such as moving too fast or too slow. The equation for the calculation of the force of friction was Ff = μ Fn
Two people wearing identical shoes can have different forces of friction depending on the surface they are on. For example, a person with the same pair of shoes standing on ice will have a less force of friction, whereas the shoes of a person standing on a mountain side will exhibit a greater force of friction. Likewise, two people wearing different types of shoes will have have the same force of friction if they are on a frictionless surfaces. The coefficients of friction determine how much force of friction an object will feel. The force of gravity and the normal force does not affect this on the other hand. Yes, the normal force DOES affect the Ff,... when the surfaces press together harder, there is more force of friction.
One source of error that we had was when we measured the force of friction of the vinyl side of the block. When we were calculating our data, the block was kept riling up. This drastically affected how the block was pulled along. Another error we had was when we pulled the block. Sometimes we pulled it too fast or too slow, which messed up how we calculated the mean of the data. In the future, I am interested in finding out how tension affects the force of friction.
I feel like I am getting better at writing lab reports because they are a lot more thorough and informative. I think I can improve my writing of these reports by being more accurate.
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