DAY 10
CLASSWORK
CH 1 Exam
Moving Man Simulation
We will finish pages 1-3 today in class. Page 4 is HW
#010A: Lab 2: Velocity
Data collection
HOMEWORK
#010B. Last page of moving man simulation
Friday, September 2nd, 2016
gather and use data to determine if an object is moving at constant velocity.
interpret constant velocity graphs
WARM-UP:
1. When and where does runner B pass runner A?
2. Do the two runners start at the same location? If not, describe the difference in starting positions.
CLASSWORK:
1. Exam Review --> Link
2. Velocity Inquiry Lab Prep
TITLE: Constant Velocity
Your team will design an experiment to compare the position of an object moving with constant velocity over a series of time intervals. Discuss with your group the variables that will need to be measured to prove that an object is moving with constant velocity. Decide which variable being measured will be dependent and which will be independent.
Measurement Equipment
You will have access to several pieces of lab equipment. There are ball bearings, ramps, meter sticks, rulers, etc. You may use objects from home if you like. Make a list of all the equipment you expect to use. You are allowed to make changes during the lab.
Discuss with your group how you could take the proper measurements to prove that your object is moving with constant velocity. Put together a list of procedures that you will follow. Perform at least three trials.
Graphing
After you take your measurements, construct a graph of your data and draw a best fit line. Construct one graph for each set of data that you take. Calculate the slope of the best fit line.
Percent Error
When you have calculated the slopes, take an average of the three values measured without the phone. Also take an average of the three values measured with the cell phone. Now compare the average value with the value that is farthest from the average. You can calculate your percent error as follows:
percent error = (average - outlier) x 100
average
For all scientific experiments we aim for a % error that is less than 5 and preferable less than 1. The smaller the better. How did your team do? Answer the following questions.
What sources of error did you identify during your experiment?
How many sources of error were sources that your team had control over?
For each of the sources of error you identified in problem two, suggest a possible way to change the experiment to minimize that source of error.
Lab Report
http://www.chem.ucla.edu/~gchemlab/labnotebook_web.htm
Materials: List all the materials used in your experiment.
Procedure: List all steps that your group followed in this experiment. Include diagrams of your experimental setup. Your procedure should be detailed enough that another group could follow your steps and get the same conclusions.
Data: Data should be listed in data tables. There should be one data table for each trial.
Analysis: Graph your data. There should be one graph per data table. Calculate the slope for each graph. Take a mathematical average for the slopes. Use the average slope to write an equation that for the line. Calculate the percent error for your data. Answer the analysis questions.
What sources of error did you identify during your experiment?
How many sources of error were sources that your team had control over?
For each of the sources of error you identified in problem two, suggest a possible way to change the experiment to minimize that source of error.
Conclusion: Answer the following conclusion questions.
What is the relationship between x and t for constant v?
Were you able to achieve constant velocity? How can you tell?
Homework:
CH 1 Exam Wednesday
1/2 sheet of notes (single side only) for HW.
You can bring your table of friends as well
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Lab Analysis
Today your group will finish analyzing the data from your lab. You will have 30 minutes to complete the lab report and turn it in.
Lab Report
Materials: List all the materials used in your experiment.
Procedure: List all steps that your group followed in this experiment. Include diagrams of your experimental setup. Your procedure should be detailed enough that another group could follow your steps and get the same conclusions.
Data: Data should be listed in data tables. There should be one data table for each trial.
Analysis: Graph your data. There should be one graph per data table. Calculate the slope for each graph. Take a mathematical average for the slopes. Use the average slope to write an equation that for the line. Calculate the percent error for your data. Answer the analysis questions.
What sources of error did you identify during your experiment?
How many sources of error were sources that your team had control over?
For each of the sources of error you identified in problem two, suggest a possible way to change the experiment to minimize that source of error.
Conclusion: Answer the following conclusion questions.
Were you successful in making your object move with constant velocity? How do you know?
What was the velocity of your object? Express in meters per second.
Graphing Position vs Time
We will be reviewing the practice problems from Ch 2, page 42, problems 21-24. After you finish your lab, attempt and discuss these problems within your groups.
Group Quiz
Your group will be looking at a direct measurement video of a moving object. Take data as Mr Alexander advances the slides and make a graph. Use the graph to calculate the velocity of the object in cm/s, m/s, and km/hr.
http://s3-us-west-2.amazonaws.com/dmvideos.org/players/july_4_cannon/july_4_cannon.html
THAT'S IT!
Happy Friday :-)