Students finished spring constant lab.
Explained how to use the F4 key in Excel to fix a cell in an equation.
Lab write-up is due next Thursday.
Friday, February 13, 2009
Thursday, Feb 12, 2009 - Block 3
Collected Oleic Acid Lab write-ups
Handed out IB Internal Assessment Guidelines and went over the Design, Data Collection and Presentation, and Results sections.
Went over spring constant lab. Asked students how they might approach it.
Instead of using a stopwatch and ruler, students will use the Vernier Motion Detector.
Explained how to collect the data for both the static and dynamic methods.
This lab will concentrate on the Data Collection and Presentation, and Results parts of the IB Internal Assessment.
Lab write-up
Static Method: I want a brief description of how students collected the data.
Show data tables complete with headers and labels.
Use Excel to create a graph
Use the Linest function to determine the uncertainty in the slope.
In the calculations section, explain and give a sample calculation for each type of calculation. Explain how you get the various quantities.
Dynamic Method: Again give a brief description of how you collected the data.
Show data tables complete with headers and labels.
Figure out what to graph to get a linear relationship
Use Excel to create a graph but this time do not force the line to go through the origin. Find the x-intercept which gives the correction factor for the mass of the spring.
Use linest to find the slope, uncertainty in slope, y-intercept, and uncertainty in y-intercept.
Determine the spring constant and its uncertainty.
Calculation section - explain and give a sample calculation for each type of calculation. Explain how you get the various quantities.
In the results section, clearly state the results along with their uncertainties. Compare and comment on the two methods. Discuss weaknesses in the two methods. Describe ways in which the procedure could be improved.
Determine the effective spring constants for combinations of springs and describe the method used to do this.
Answer the questions at the end of the lab explaining in your answer what it is you are answering.
Students worked in groups of two.
There was only one spring per group so they had to share for Part 3 of the lab.
Not all lap-tops had Logger Pro 3.5 on them
Students did not finish so I told them they could finish tomorrow.
I collected RA 11.1
Handed out IB Internal Assessment Guidelines and went over the Design, Data Collection and Presentation, and Results sections.
Went over spring constant lab. Asked students how they might approach it.
Instead of using a stopwatch and ruler, students will use the Vernier Motion Detector.
Explained how to collect the data for both the static and dynamic methods.
This lab will concentrate on the Data Collection and Presentation, and Results parts of the IB Internal Assessment.
Lab write-up
Static Method: I want a brief description of how students collected the data.
Show data tables complete with headers and labels.
Use Excel to create a graph
Use the Linest function to determine the uncertainty in the slope.
In the calculations section, explain and give a sample calculation for each type of calculation. Explain how you get the various quantities.
Dynamic Method: Again give a brief description of how you collected the data.
Show data tables complete with headers and labels.
Figure out what to graph to get a linear relationship
Use Excel to create a graph but this time do not force the line to go through the origin. Find the x-intercept which gives the correction factor for the mass of the spring.
Use linest to find the slope, uncertainty in slope, y-intercept, and uncertainty in y-intercept.
Determine the spring constant and its uncertainty.
Calculation section - explain and give a sample calculation for each type of calculation. Explain how you get the various quantities.
In the results section, clearly state the results along with their uncertainties. Compare and comment on the two methods. Discuss weaknesses in the two methods. Describe ways in which the procedure could be improved.
Determine the effective spring constants for combinations of springs and describe the method used to do this.
Answer the questions at the end of the lab explaining in your answer what it is you are answering.
Students worked in groups of two.
There was only one spring per group so they had to share for Part 3 of the lab.
Not all lap-tops had Logger Pro 3.5 on them
Students did not finish so I told them they could finish tomorrow.
I collected RA 11.1
Wednesday, Feb 11, 2009 - Block 3
We went to the computer lab and students did the Excel Spreadsheet Exercise. This was an improved version which included error bars and the use of the LINEST function.
Students did all parts of the exercise including the parts dealing with finding uncertainty using the Min-Max Method and the Method of Relative Uncertainty.
When done, students could work on redoing their uncertainty homework or on the Oleic Acid Lab write-up
Students did all parts of the exercise including the parts dealing with finding uncertainty using the Min-Max Method and the Method of Relative Uncertainty.
When done, students could work on redoing their uncertainty homework or on the Oleic Acid Lab write-up
Tuesday, Feb 10, 2009 - Block 3
Went over RA 10, RA 11.2
Started lecture on SHM
Did not get very far but did discuss spring constants.
Started lecture on SHM
Did not get very far but did discuss spring constants.
Monday, Feb 9, 2009 - Block 3
Collected RA 11.2
Handed out RA 11.1
Students did Oleic Acid Lab
Write-up is due Thursday.
Handed out RA 11.1
Students did Oleic Acid Lab
Write-up is due Thursday.
Friday, February 6, 2009
Friday, Feb 6, 2009 - Block 3 - IB Physics 2
Collected RA 10
Asked if there were any questions on the BB pancake lab. Most students liked being able to check their answers with the computer program and be able to rework them if their answers were not correct - and not have to hand in a lab write-up.
Told students that the Pendulum Lab will be postponed until Friday since I was able to book the computer lab for Wednesday.
Showed Hewitt video on Scaling. Handed out RA 11.2.
Gave students time to work on RA 11.2 in class.
If they don't finish it, finish it for homework and hand in on Monday.
In addition, the homework for Monday is to do the problems on the uncertainty worksheet. Students can put their answers on the excel spreadsheet and hand that in.
Handed out Oleic Acid Lab sheet. Students will do this lab on Monday.
Asked if there were any questions on the BB pancake lab. Most students liked being able to check their answers with the computer program and be able to rework them if their answers were not correct - and not have to hand in a lab write-up.
Told students that the Pendulum Lab will be postponed until Friday since I was able to book the computer lab for Wednesday.
Showed Hewitt video on Scaling. Handed out RA 11.2.
Gave students time to work on RA 11.2 in class.
If they don't finish it, finish it for homework and hand in on Monday.
In addition, the homework for Monday is to do the problems on the uncertainty worksheet. Students can put their answers on the excel spreadsheet and hand that in.
Handed out Oleic Acid Lab sheet. Students will do this lab on Monday.
Thursday, February 5, 2009
Thursday, Feb 5, 2009 - Block 3
Told students that next Wednesday I plan to have them do a major IB lab - what are the various factors that affect the period of a pendulum? They will have to think of how to do this using the Vernier equipment.
Asked if there were any questions on the IB Physics 1 review problems. There were none.
Went over uncertainties. Students measured length and width of a table top and estimated the uncertainties in each measurement.
Calculated the perimeter and its uncertainty. If you add or subtract quantities, you ADD the absolute uncertainty to get the uncertainty in the result.
After you get the uncertainty, this determines how you display your result. You can have AT MOST 2 sig figs in the uncertainty and then the number of decimal places in the uncertainty is the same as the number of decimal places in the result.
Showed how to calculate the area and uncertainty in the area using the min-max method and the method of relative uncertainty.
Students did the BB Pancake Lab.
I demonstrated how to use an micrometer so they could actually measure the diameter of the BB.
I set up a computer with an Excel spreadsheet so they could input their data table and check their answers with uncertainty.
Handed RA 10 due tomorrow. Handed out a worksheet on uncertainties due on Monday. Along with the worksheet I handed out the print of an excel program for them to input their answers.
Asked if there were any questions on the IB Physics 1 review problems. There were none.
Went over uncertainties. Students measured length and width of a table top and estimated the uncertainties in each measurement.
Calculated the perimeter and its uncertainty. If you add or subtract quantities, you ADD the absolute uncertainty to get the uncertainty in the result.
After you get the uncertainty, this determines how you display your result. You can have AT MOST 2 sig figs in the uncertainty and then the number of decimal places in the uncertainty is the same as the number of decimal places in the result.
Showed how to calculate the area and uncertainty in the area using the min-max method and the method of relative uncertainty.
Students did the BB Pancake Lab.
I demonstrated how to use an micrometer so they could actually measure the diameter of the BB.
I set up a computer with an Excel spreadsheet so they could input their data table and check their answers with uncertainty.
Handed RA 10 due tomorrow. Handed out a worksheet on uncertainties due on Monday. Along with the worksheet I handed out the print of an excel program for them to input their answers.
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