Newton\'s Laws PDF

Preview

Summary

newtons law...

Description

Slide 1 Force (200 Hz) Remote 1  

5 4 3

Fᵧ(N)

2 1 0 1 2 3 4 5 0





1

2

3

4

5

6

7

Rezero sensor 

8

9

10

Time(s)

Part 1: Weighing the IOLab Device Before you weigh the IOLab device, make sure you have calibrated it with your computer. Note that, if you need to calibrate the device now, you must exit the lesson player before doing so (and then return to this lab). Now, while the IOLab device is resting on your desk, click on “Record” and then click “Rezero sensor”. Then pick up and hold the IOLab device by the screw and hold it still for a couple seconds. Based on the graph, find the weight of the IOLab device (1 points) 2 Newtons

Note that in this lab you will be using more of the tools in the IOLab software. If you need a review you should consider rewatching the Looking at Your Data video

Slide 2

a(m/s²)

Accelerometer (200 Hz) Remote 1 20 15 10 5 0 5 10 15 20





A

A

Az



0

1

2

3

4

5

6

7

8

9

10

Time(s)

Fᵧ(N)

Force (200 Hz) Remote 1  

5 4 3 2 1 0 1 2 3 4 5 0





1

2

3

4

5

6

Rezero sensor 

7

8

9

10

Time(s)

Part 2: The Relationship Between F and a Click record and hold the IOLab device from the screw and move it up and down. You may have to rezero the sensor before doing so. Record your observations of the Accelerometer and Force graphs. (1 point) the patterns for both graphs are the same. however numerically the magnitudes of the graphs are not the same values

Slide 3

Force(N)

Accelerometer [Norm] vs Force [Fᵧ] (100 Hz) Swap axis 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0

2

4

6

8

10

12

14

16

18

20

22

Accelerometer(m/s²)

1

2

3

4

5

6

7



Part 2: The Relationship Between F and a From the toolbar, choose parametric plot mode (as indicated by the red arrow). Then bring the cursor down to the small graph below the main graph and highlight the portion of the graph that the IOLab device was moving up and down. You should get a graph similar to the one pictured below.

Slide 4

a(m/s²)

Accelerometer (200 Hz) Remote 1 20 15 10 5 0 5 10 15 20





A

A

Az



0

1

2

3

4

5

6

7

8

9

10

Time(s)

Fᵧ(N)

Force (200 Hz) Remote 1  

5 4 3 2 1 0 1 2 3 4 5 0





1

2

3

4

5

6

7

8

Rezero sensor 

9

10

Time(s)

Part 2: The Relationship Between F and a Now answer the following questions analyzing your data from parts 1 and 2. Note that you may have to click the parametric plot mode button again after continuing to this slide. What do these graphs tell you about the relationship between F and a? (2 points) they have a direct relationship, meaning as F increases so does a

What is the mass of the IOLab device as calculated from the Force vs Accelerometer graph? (1 points) 0.182 kg

How else can you determine the mass of the IOLab device just by knowing its weight? (1 point) you would have to divide the weight by the force of gravity to get its mass

Slide 5 Part 3: Friction For this part, you will need to use 2 different surfaces to pull the IOLab device on as well as 2 objects of different mass to put on it. Weigh each mass. Note that the force sensor can only measure up to 10 N. Heavier masses will give you data that is easier to interpret, but you will need to use a scale to measure anything heavier than 10 N. Describe the first surface you are using (1 point) wooden desk

Describe the second surface you are using (1 point) rug

What did you use for mass 1? What is its mass in kg? (1 point) marker, 0.004 kg

What did you use for mass 2? What is its mass in kg? (1 point) glasses, 0.031 kg

Slide 6 Force (200 Hz) Remote 1  

5 4 3

Fᵧ(N)

2 1 0 1 2 3 4 5 0

 

1

Rezero sensor

2

3

4

5

6

7

8

9

10

Time(s)

Part 3: Friction Place the IOLab device with the red felt side down (wheel side up) on Surface 1 and place Mass 1 on it. Begin recording and pull the IOLab device by the hook. As you pull, pay attention to what the graph does at the moment the device begins to move. Continue to pull the device for a couple seconds at a constant speed while paying attention to what the graph does. It may help to insert a piece of string into the loop of the hook and pull it with that. You should get a graph something like the one below. You may have to try several times. If you cannot get the graph to look like the one below, you may not have enough weight on the IOLab device or you may be using too smooth of a surface.

Slide 7 Force (200 Hz) Remote 1  

5 4 3

Fᵧ(N)

2 1 0 1 2 3 4 5 0

 

1

Rezero sensor

2

3

4

5

6

7

8

9

10

Time(s)

Part 3: Friction Place the IOLab device with the red felt side down (wheel side up) on Surface 1 and place Mass 2 on it. Begin recording and pull the IOLab device by the hook. As you pull, pay attention to what the graph does at the moment the device begins to move. Continue to pull the device for a couple seconds at a constant speed while paying attention to what the graph does.

Slide 8 Force (200 Hz) Remote 1  

5 4 3

Fᵧ(N)

2 1 0 1 2 3 4 5 0

 

1

Rezero sensor

2

3

4

5

6

7

8

9

10

Time(s)

Part 3: Friction Place the IOLab device with the red felt side down (wheel side up) on Surface 2 and place Mass 1 on it. Begin recording and pull the IOLab device by the hook. As you pull, pay attention to what the graph does at the moment the device begins to move. Continue to pull the device for a couple seconds at a constant speed while paying attention to what the graph does.

Slide 9 Force (200 Hz) Remote 1  

5 4 3

Fᵧ(N)

2 1 0 1 2 3 4 5 0

 

1

Rezero sensor

2

3

4

5

6

7

8

9

10

Time(s)

Part 3: Friction Place the IOLab device with the red felt side down (wheel side up) on Surface 2 and place Mass 2 on it. Begin recording and pull the IOLab device by the hook. As you pull, pay attention to what the graph does at the moment the device begins to move. Continue to pull the device for a couple seconds at a constant speed while paying attention to what the graph does.

Slide 10 Analysis Questions In question 1, refer to the graph of any one of your trials. Note that if you leave the slide and come back your answers will be kept, even if you haven't saved the slide. 1. Describe where on the graph the IOLab device began to move. (1 points) once the device was pulled forward the graoh dipped downward, and when the device went to rest it went back to 0.

In questions 2-7, you will need to consider all of your trials. 2. As the material gets rougher, what happens to the force of kinetic friction? (1 point) as the material gets rougher it became harder to pull the device at a constant rate. the force of friction increases on the rug.

3. As we increase the mass, what happens to the normal force between the IOLab device and the surface it is placed on? (1 point) it increases the pulling difficulty since it made the device harder to pull against the surface.

4. As we increase the normal force, what happens to the force of kinetic friction? (1 point) the kinetic friction increases against the surface.

Slide 11 Analysis Questions 5. What is the average coefficient of kinetic friction for the IOLab device/Surface 1 combination? For this lab, the normal force is given by the total weight (IOLab device plus mass placed on top). (2 points) 0.1

6. What is the average coefficient of kinetic friction for the IOLab device/Surface 2 combination? For this lab, the normal force is given by the total weight (IOLab device plus mass placed on top). (2 points) 0.4

7. What is the maximum coefficient of static friction for the IOLab device/Surface 1? Again, the normal force in this experiment is the total weight. (2 points) 0.52

8. What is the maximum coefficient of static friction for the IOLab device/Surface 2? Again, the normal force in this experiment is the total weight. (2 points) 0.46

9. Based on your data, what can you conclude about the relationship between static and kinetic friction? (2 points) static friction is greater than kinetic friction. static friction is what is keeping the device from moving, so it must be overcome with a force sufficient enough before the device could move....