## PHY LAB HW a

All the instructions are available in the videos’ links and below:

Instructional video -3: https://we.tl/t-UhZrxbPyOX

spreadsheet instructions-3:

Spreadsheet instructions-3In these calculations, the Coulomb constant has a value of

Part I (Label the tab “macro”): This is the macroscopic data. Note that:

Starting in cell D2, record all of your force measurements down the D column. In cell A1, record the initial position of q1. In cell A2, record the initial position of q2. The difference in those positions is the first separation between the charges. Place this value in B2. In cell B3, type (without quotes) “B2 0.1”. Hit enter. Copy the formula down to the last force measurement. Finally, in cell C2, type “B2/100”, and copy the formula down.

1.Place column labels in cell 1. In cell C1, it is . In D1, it is .

2. Plot . Make sure you insert the correct graph! It looks like in inverse-square curve. Label the graph for presentation. Afterwards, run a trendline by right-clicking the data. Chose power fit. Place the equation on the graph and enhance the size. Note the power of the fit. Record and label on the spreadsheet close to the graph the power obtained and the coefficient. Note: Do NOT run a LINEST or linear fit here!!!!!

For this analysis, using the Coulomb equation and this coefficient, calculate q. Record this value in SI based units as well as in micro-Coulombs.

Part II (Label a new tab “micro”): You are given that . Note that this scale is now in picometers.

Starting in cell D2, record all of your force measurements down the D column. In cell A1, record the initial position of q1. In cell A2, record the initial position of q2. The difference in those positions is the first separation between the charges. Place this value in B2. In cell B3, type (without quotes) “B2 0.1”. Hit enter. Copy the formula down to the last force measurement. Finally, in cell C2, convert first value to meters, and copy the formula down.

1.Place column labels in cell 1. In cell C1, it is . In D1, it is .

2. Plot . Make sure you insert the correct graph! It looks like in inverse-square curve. Label the graph for presentation. Afterwards, run a trendline by right-clicking the data. Chose power fit. Place the equation on the graph and enhance the size. Note the power of the fit. Record and label on the spreadsheet close to the graph the power obtained and the coefficient. Note: Do NOT run a LINEST or linear fit here!!!!!

For this analysis, using the Coulomb equation and this coefficient, calculate . Record this value in SI based units as well as in micro-Coulombs. Also, record the polarity. Is it is negative or positive ion? How do you know?

4. Plot . Is it linear? Label the graph for presentation. Run a LINEST by highlighting a 2 x 5 matrix starting around cell A15 or so. Record the value of the slope and the uncertainty (e.g. ).

For this analysis, using the slope and the Coulomb constant, calculate . Record this value in SI based units as well as in micro-Coulombs. Also, compare with your first calculation and comment.

Part III (Create a tab called “summary”): Insert large text boxes to type in.

In the summary tab, address these questions:

From the data (you) collected, does the power fit indeed illustrate the inverse-square Law?

Suppose you placed another charge () on the opposite end of the ruler of (a) equal value as and with the same sign and (b) a charge .

Describe how the force on would look as a function of position starting at the original point as before, and then moving towards the right for both scenarios (a) and (b)? Analyze one scenario at a time! Take a stab at it. How would you begin to investigate this?

Suppose you were in a lab doing these measurements, assuming well-calibrated equipment, list some random errors you would encounter.

Save the file and upload.

Macro coulomb interactions-measurement-3:https://we.tl/t-aeNXb1uLwC

Micro coulomb interactions-measurement-3:https://we.tl/t-2QJYHdhKeo

## PHY LAB HW b

Physics Assignment Help All the instructions are given in the video’s link and below:

Coulomb’s law measurement:

Coulomb’s Law-measurementFor each charge separation, measure the value of and note the value of the force meter. Pause the video to take careful measurements. Measure to at least three sig. figs. (if possible)

Place position () values in meters in column A, in column B, and force () in column C. All of these values should be SI base units.

1.Place column labels in cell 1. Start placing values in cell 2.

2. In Column B, you are merely multiplying the constant by the inverse of column B: =8.99E09*B2. Copy the formula down.

3. Plot . Make sure you insert the correct graph! Label the graph for presentation. Afterwards, run a trendline by right-clicking the data. Chose power fit. Place the equation on the graph. Note the power it fit the curve with.

4. Plot . Is it linear? Label the graph for presentation. Run a LINEST by highlighting a 2 x 5 matrix starting around a15 or so. The theoretical slope should be the product of the two charges. So the slope should have units of . Note the value of the slope and its uncertainty.

5. In the summary tab, address these questions:

From the data (you) collected, does the power fit indeed illustrate the inverse-square Law? Explain.

We don’t know the charge on either sphere. But, we DO KNOW the product. Determine the product of the charges. Does your result seem reasonable?

List all random error in this lab that you can identify. Would these account for any discrepancies for the power fit?

Save the file and upload.

Measurements video: https://we.tl/t-ckoi3BGyy6

## Module Two Lab Activity Velocity and Acceleration – A Virtual PhET Lab Objectives After completing this lab activity, the

Module Two Lab Activity

Velocity and Acceleration – A Virtual PhET Lab

Objectives

After completing this lab activity, the students should be able to:

Calculate velocity

Calculate acceleration

Determine position, velocity, and acceleration using the graphs

Write a lab report

Lab Report

The lab report must include the following:

Title

Introduction

Experimental Details or Theoretical Analysis

Results

Discussion

Conclusions and Summary

References

Please visit the following website to learn more about lab reports:

ASC Format for Laboratory Reports

An example of a lab report is given on the following website:

Professor K Samples

Lab Activity

Please follow the steps given below to conduct the experiment:

This lab requires you to produce a lab report to determine “Velocity and Acceleration.” This is the “Title” of your lab report.

Read the relevant chapter on velocity and acceleration and add an “Introduction.” (Attached chapter 2. Please only use chapter 2 and the lab as references)

You conduct this lab by connecting to the PhET website by clicking on the link given below (or where applicable through the embedded simulation on the lab page):

The Moving Man: https://phet.colorado.edu/sims/cheerpj/moving-man/latest/moving-man.html?simulation=moving-man

Attribution:

PhET Interactive Simulations

University of Colorado Boulder

phet.colorado.edu

(If you cannot use the above simulation or cannot get to the website by clicking on the link, please copy and paste the link into your browser. If the simulation is not running, please check if you have the latest Java, Adobe Flash, or HTML5 software [depending on the simulated lab]. If you download the relevant software and attempt to run the simulation and it is still not working, please call the IT helpdesk. It also could be that your computer does not have sufficient space to run the simulation. Please check all the possibilities).

For this experiment, you use the “Charts” section of the lab. After you click the Charts section of the lab, select the “velocity” and “acceleration” tools (left-hand side). You can change the position, velocity, and acceleration values as per the scenarios given below and relevant graphs will appear on the screen. (Also, note the “record” button at the bottom of the simulation. You can select this function and run the simulation. Then, use the “playback” button to view the experiment again to note the time values for that scenario.) This information constitutes the “Experimental Details” section of the lab report. You must keep a record of the details information of the graphs appearing on the screen as experimental values for each scenario. These values form part of the “Results” section of the lab report. Now, complete the theoretical calculations of velocity and acceleration for each scenario using relevant equations. These calculated values also form the “Results” section of the lab report.

Now, you can complete the “Discussion” section of your lab report by comparing the values and discussing any differences in the theoretical and experimental values and any other information relevant to the experiment.

Complete the lab report by adding a summary to the “Conclusion” section of your lab report.

Submit the lab report to the relevant Canvas Dropbox

Lab Scenarios

Using the Moving Man simulation chart section, develop Position v. Time, Velocity v. Time, and Acceleration v. Time graphs for the following scenarios and use them as the experimental results of your lab report (screenshots or take pictures of the graphs, in addition to hand-drawn graphs with actual time values). Remember to explain the graphs, how to calculate velocity or acceleration, and what information can be gathered from the area under each graph in your discussion section.

1. Constant velocity (5 m/s) for 10 m.

2. Constant velocity (-2 m/s) for 5m.

3. Constant acceleration (-2 m/s2) for 10m.

4. Constant acceleration ( 3 m/s2) for 10m.

Please discuss (without using the simulation), the following two scenarios:

1. An object is travelling in a positive direction and change to negative velocity – discuss. What possibilities are there for acceleration values?

2. An object is travelling in a negative direction and change to positive velocity – discuss. What possibilities are there for acceleration values?

N.B.: When operating the simulation, it is better to enter only the velocity or acceleration value for each scenario. Do not enter the position values, since this would change the initial position. You control the position value by stopping the simulation when the man has moved the desired distance.