Key Question Experiment 1: How is the friction force affected by how hard the surfaces are pressed together?
IV: Fn
DV:Ff
CV: Velocity
Secondary Experiment: To find out if the surface material affects the force of friction
Prediction: I predict that if you add more mass to the block you will add more pressure from the block to the surface and the friction force will increase.
Apparatus List: A surface, a block with felt on one side and rubber on the other side, lab quest mini, a computer, dual range force sensor, masses.
Procedure: First we have to weigh the block with the felt and rubber on it and convert it to newtons.
Then we will attach the block to the dual range force sensor. Then we will drag the sensor at a constant speed to test the force of friction.When you pull the sensor, the block will be rubbing on the table surface, which is how we test the force of friction. We will continue to add weights on top of the block, repeating the same process as before while recording the friction force. We will do this for both surfaces, rubber and felt.
Experiment 1.A: Felt Surface
Data Collection/Data Analysis:
DV:Ff
CV: Velocity
Secondary Experiment: To find out if the surface material affects the force of friction
Prediction: I predict that if you add more mass to the block you will add more pressure from the block to the surface and the friction force will increase.
Apparatus List: A surface, a block with felt on one side and rubber on the other side, lab quest mini, a computer, dual range force sensor, masses.
Procedure: First we have to weigh the block with the felt and rubber on it and convert it to newtons.
Then we will attach the block to the dual range force sensor. Then we will drag the sensor at a constant speed to test the force of friction.When you pull the sensor, the block will be rubbing on the table surface, which is how we test the force of friction. We will continue to add weights on top of the block, repeating the same process as before while recording the friction force. We will do this for both surfaces, rubber and felt.
Experiment 1.A: Felt Surface
Data Collection/Data Analysis:
Normal Force(Newtons)
|
Friction(Newtons)
|
.631
|
.1674
|
.839
|
.2068
|
1.6
|
.4114
|
2.6
|
.5423
|
3.57
|
.6452
|
5.54
|
1.295
|
Friction Force Vs. Normal Force
VM: As the normal force increases, the force of friction increases linearly.
MM: Ff=(.2174 N/N)Fn +.0078N
Slope: For every 1 N added to the Fn, the Friction Force increases .2174 N.
Y-Int: When the Fn is at 0N, the Friction Force is .0078N
Experiment 1.B: Rubber Surface
Data Collection/Data Analysis:
| Normal Force(Newtons) |
Friction(Newtons)
|
.63
|
.8481
|
.839
|
1.172
|
1.6
|
1.576
|
2.6
|
2.604
|
3.57
|
3.409
|
5.54
|
4.527
|
Friction Force Vs. Normal Force
VM:As the normal force increases, the force of friction increases linearly.
MM: Ff=(.804 N/N)Fn + .322N
Slope: For every 1 N added to the Fn, the friction force is .804 N.
Y-Int: When Fn is at 0N, the friction force is .322 N.
Velocity Experiment: How does the velocity affect the force of friction?
Force of Friction vs. Velocity
IV: Velocity
DV: Ff
CV: Fn(mass), Surfaces
Procedure: First we will measure the block's mass to get the normal force. After finding the normal force, we will pull the block at various speed to see if it affects the force of friction. During the experiment we will keep mass and surface material the same.
MM: Ff=(.804 N/N)Fn + .322N
Slope: For every 1 N added to the Fn, the friction force is .804 N.
Y-Int: When Fn is at 0N, the friction force is .322 N.
Velocity Experiment: How does the velocity affect the force of friction?
Force of Friction vs. Velocity
IV: Velocity
DV: Ff
CV: Fn(mass), Surfaces
Procedure: First we will measure the block's mass to get the normal force. After finding the normal force, we will pull the block at various speed to see if it affects the force of friction. During the experiment we will keep mass and surface material the same.
When we tested if velocity affected Ff, we found out that velocity had no effect on the Ff.
Surface Area Experiment: How does the surface area affect the force of friction?
Force of Friction vs. Surface Area
IV: Surface Area
DV: Ff
CV: Speed, Surface Material
Procedure: First we will measure the surface area of each side of the block. After we know how much surface area each side of the block has, we will test the force of friction on each side of the block by pulling it with the force dual sensor. During the experiment we will drag the block at a constant speed and keep the same surface material.
We found out that surface area has no effect on force of friction.
where is my graph?
Conclusion:
In this lab we had to test how various actions would affect the force of friction, we found out that only changing the amount of pressure on an object will affect the force of friction.and the surface material! Changing the velocity and surface area do not affect the force of friction. In the big picture, this will really help us because now we know that only applying more pressure will the force of friction change.equation? what is slope called and what does it mean?
Everyones graph had roughly the same graph plot because all the experiment were done the same way. that means everyone should have had the same data, but of course we have to consider human errors as well. my prediction was correct that if you do add more mass to an object, its force of friction will increase.
It is possible for two people wearing he same shoes to have the different forces of friction because they can both weigh different meaning the force of friction will change. people wearing different shoe can have the same force of friction because maybe their weight to surface material friction could be the same. only pressure given on the object will change the force of friction, not surface area or velocity.
One error was that someone couldn't pull the sensor at a constant speed. and one other error could be if the block weighs differently or the surfaces had different frictions.
This lab was really fun and i learned a lot from the experiments.
Surface Area Experiment: How does the surface area affect the force of friction?
Force of Friction vs. Surface Area
IV: Surface Area
DV: Ff
CV: Speed, Surface Material
Procedure: First we will measure the surface area of each side of the block. After we know how much surface area each side of the block has, we will test the force of friction on each side of the block by pulling it with the force dual sensor. During the experiment we will drag the block at a constant speed and keep the same surface material.
We found out that surface area has no effect on force of friction.
where is my graph?
Conclusion:
In this lab we had to test how various actions would affect the force of friction, we found out that only changing the amount of pressure on an object will affect the force of friction.and the surface material! Changing the velocity and surface area do not affect the force of friction. In the big picture, this will really help us because now we know that only applying more pressure will the force of friction change.equation? what is slope called and what does it mean?
Everyones graph had roughly the same graph plot because all the experiment were done the same way. that means everyone should have had the same data, but of course we have to consider human errors as well. my prediction was correct that if you do add more mass to an object, its force of friction will increase.
It is possible for two people wearing he same shoes to have the different forces of friction because they can both weigh different meaning the force of friction will change. people wearing different shoe can have the same force of friction because maybe their weight to surface material friction could be the same. only pressure given on the object will change the force of friction, not surface area or velocity.
One error was that someone couldn't pull the sensor at a constant speed. and one other error could be if the block weighs differently or the surfaces had different frictions.
This lab was really fun and i learned a lot from the experiments.
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