Handed back Ball and Soap Lab, Newton's Law of Cooling Lab
Asked for input on how to make the class better.
Students can do Tsokos problems for credit. Problems must be shown in detail using good problem solving strategy.
Handed back and went over Heat and Thermo test in detail.
On Wednesday, students will do a lab investigating motion of a floating object. Please let me know tomorrow if you need equipment for Wednesday's Lab. Students should use Vernier Equipment in some fashion.
Started SHM
Reviewed equations of motion for constant force
Reviewed Uniform circular motion in which force has a constant magnitude but continually changes direction.
Described SHM - periodic motion that repeats over the same path in which there is a restoring force proportional to the displacement.
SHM: F = - k x
for a spring, k is the spring constant. It is always a positive number.
Showed how to measure the spring constant using Newton's First Law.
Described amplitude, period, frequency
Described radians.
Showed that angular velocity = linear velocity/R = 2 * pi/Period = 2 * pi * f
Finished with short demo using turntable that SHM is a 1-D projection of 2-D Uniform Circular Motion.
Monday, March 14, 2011
Thursday, March 3, 2011
Thursday, Mar 3, 2011
Showed Hewitt video on Heat Transfer, stopping often to emphasize important points. Showed demos of thermal conductivity and heating a balloon with and without water.
Emphasized the macroscopic and microscopic interpretations of hot air rising.
Showed equations for thermal conductivity - got it by intuiting it.
Showed sea breeze examples of convection
Showed Wien's Law and Stefan-Boltzmann equations for radiation. Gave examples of green house effect and power emitted by stars.
Students finished class by working in their packet on the Kinetic Theory.
Emphasized the macroscopic and microscopic interpretations of hot air rising.
Showed equations for thermal conductivity - got it by intuiting it.
Showed sea breeze examples of convection
Showed Wien's Law and Stefan-Boltzmann equations for radiation. Gave examples of green house effect and power emitted by stars.
Students finished class by working in their packet on the Kinetic Theory.
Wednesday, Mar 2, 2011
Students did heat capacity lab. Cut it down to just data acquisition and processing with clearly stated conclusion. Thought that because I told them to determine the density and specific heat capacity (and molar heat capacity) that was telling them too much for the IB planning aspect.
Lab write-up due on Friday.
Lab write-up due on Friday.
Monday, Feb 28, 2011
Went over microscopic view of heat capacity using bucket examples.
Continued in packet.
Continued in packet.
Friday, February 25, 2011
Friday, Feb 25, 2011
Collected Ball and Soap Labs
Introduction to Heat, Temperature, and Thermodynamics
Handed out note packets from Tsokos sections 3.1-2
Definitions of Temperature, Heat, Internal Energy
Demo of hands in water
Temperature scales
Heating curve
Heat capacity and specific heat capacity
Latent heats
Calorimetry problems - heat lost = heat gained
Asked students to do reading assignment question pages in packet
Try problems in Thermal Energy packet
Do problems at end of section in text book
Introduction to Heat, Temperature, and Thermodynamics
Handed out note packets from Tsokos sections 3.1-2
Definitions of Temperature, Heat, Internal Energy
Demo of hands in water
Temperature scales
Heating curve
Heat capacity and specific heat capacity
Latent heats
Calorimetry problems - heat lost = heat gained
Asked students to do reading assignment question pages in packet
Try problems in Thermal Energy packet
Do problems at end of section in text book
Wednesday, February 23, 2011
Wednesday, Feb 23, 2100
Gave several problems from IB Physics 1 for review:
Rocket problems
Projectile motion problems
Inclined plane problems
Geosynchronous orbit problem
Showed how to get gravitational potential energy
Used this equation to calculate escape velocities and size of Earth if Earth were black hole
Rocket problems
Projectile motion problems
Inclined plane problems
Geosynchronous orbit problem
Showed how to get gravitational potential energy
Used this equation to calculate escape velocities and size of Earth if Earth were black hole
Tuesday, February 8, 2011
Wed Feb 9, 2011
Ask if any problems or questions on worksheet or Quia
Did Uncertainty Quiz in class
Students do BB lab
Explained the various uncertainties involved
Students checked calculations on laptops
HW - Try Quia on Uncertainties again
Did Uncertainty Quiz in class
Students do BB lab
Explained the various uncertainties involved
Students checked calculations on laptops
HW - Try Quia on Uncertainties again
Monday, February 7, 2011
Tues Feb 8, 2011
HW for tomorrow:
Do problem sheet on uncertainty (omit min max)
Do Quia on uncertainty
Check for textbook covers.
Collect Parent Notification Forms
Collect Course Expectation Forms
Chastised students for not putting on covers or doing Quia
Students wrote density measurements on board:
Block Mass(g) Length(cm) Width(cm) Height(cm) Density(g/cm^3)
Are they the same? How close do they have to be to be considered the same?
All the blocks were made of the same material, Aluminum.
How can we tell if the measurements are "good enough"
Hand out Flow Chart 1.2
Random Errors
Show how to calculate the uncertainty for several measurements
unc = sum(|meas - avg)|/# measurements
We did this in the Measurement and Graphing Lab of IB Physics 1 (Diameter vs Circumference)
If all measurements are the same, uncertainty is 1/2 the reading error
Rules for uncertainty:
1. At most 2 sig figs in uncertainty
2. Quantity then has the same number of decimal places as uncertainty
Reading errors
1. For analog devices, uncertainty is 1/2 the scale division...but, you often have this same uncertainty at each end of a ruler so the uncertainty in the length is the scale division
2. For digital devices, uncertainty is scale division
Adding or subtracting quantities:
If you add or subtract values, you add the absolute uncertainties.
Showed example of finding perimeter of circle.
Method of Relative Uncertainty:
Derived the relative uncertainty equation for a rectangle.
Used this equation in several examples: Area of square, volume of sphere
Showed that the absolute value of the exponent becomes the coefficient for the relative uncertainty.
Did a weird example: Q = A^2 * B^(5/3) * C^(-10)/D^(3/7)
unc Q = Q * 2*uncA/A + (5/3)*uncB/B + 10*uncC/C + (3/7)*uncD/D
Using Excel for uncertainty calculations:
Students got laptops and pulled up Excel spreadsheet
Entered in headers and then data from density lab
Calculated density and uncertainty and wrote using correct number of significant digits.
Handed out notes and problems on uncertainty
HW students work these problems (except max min problems)
Do Quia on uncertainty
Do problem sheet on uncertainty (omit min max)
Do Quia on uncertainty
Check for textbook covers.
Collect Parent Notification Forms
Collect Course Expectation Forms
Chastised students for not putting on covers or doing Quia
Students wrote density measurements on board:
Block Mass(g) Length(cm) Width(cm) Height(cm) Density(g/cm^3)
Are they the same? How close do they have to be to be considered the same?
All the blocks were made of the same material, Aluminum.
How can we tell if the measurements are "good enough"
Hand out Flow Chart 1.2
Random Errors
Show how to calculate the uncertainty for several measurements
unc = sum(|meas - avg)|/# measurements
We did this in the Measurement and Graphing Lab of IB Physics 1 (Diameter vs Circumference)
If all measurements are the same, uncertainty is 1/2 the reading error
Rules for uncertainty:
1. At most 2 sig figs in uncertainty
2. Quantity then has the same number of decimal places as uncertainty
Reading errors
1. For analog devices, uncertainty is 1/2 the scale division...but, you often have this same uncertainty at each end of a ruler so the uncertainty in the length is the scale division
2. For digital devices, uncertainty is scale division
Adding or subtracting quantities:
If you add or subtract values, you add the absolute uncertainties.
Showed example of finding perimeter of circle.
Method of Relative Uncertainty:
Derived the relative uncertainty equation for a rectangle.
Used this equation in several examples: Area of square, volume of sphere
Showed that the absolute value of the exponent becomes the coefficient for the relative uncertainty.
Did a weird example: Q = A^2 * B^(5/3) * C^(-10)/D^(3/7)
unc Q = Q * 2*uncA/A + (5/3)*uncB/B + 10*uncC/C + (3/7)*uncD/D
Using Excel for uncertainty calculations:
Students got laptops and pulled up Excel spreadsheet
Entered in headers and then data from density lab
Calculated density and uncertainty and wrote using correct number of significant digits.
Handed out notes and problems on uncertainty
HW students work these problems (except max min problems)
Do Quia on uncertainty
Monday Feb 7, 2010
HW due tomorrow:
Hand in signed course expectation form
Hand in signed Parent Notification form
Cover both textbooks
Do Quia quiz on A1 General Knowledge
Hand out:
Student Profile - Students complete and put in bin for 10 pts
Course Expectation Form
Student and Parent Form for Course Expectations - students return for 5 pts
Parent Notification Form - Students return one signed copy for 10 pts. (Keep the other at home since it has my contact info)
Hand out Tsokos books
Go over Expectation Form
Hand out Quia Passwords
Assign Quia Quiz on A1 - General Knowledge
Hand out flowchart 1.1
Get Hewitt textbooks
Go over rapid estimation problem of how many atoms are in the Sun
First asked for guestimates on answer.
Used circumference of Earth from definition of meter
Used diameter of Sun since ~100 Earths span the Sun
Derived tidal equation - used fact that Moon just covers Earth in total eclipse to show, for Moon and Earth that ratio of diameter to distance is the same. Ratio of tidal forces becomes ratio of densities. Moon is rock. Moon's effect on tides ~ 2.2 times that of Sun so density ~ 2.2 times that of Sun. Use density of Sun to be about 1.
Used value of mole to calculate number of atoms in Sun.
Introduction to uncertainties:
Handed out a block of aluminum to each student and asked them to find the density of that piece of metal.
Hand in signed course expectation form
Hand in signed Parent Notification form
Cover both textbooks
Do Quia quiz on A1 General Knowledge
Hand out:
Student Profile - Students complete and put in bin for 10 pts
Course Expectation Form
Student and Parent Form for Course Expectations - students return for 5 pts
Parent Notification Form - Students return one signed copy for 10 pts. (Keep the other at home since it has my contact info)
Hand out Tsokos books
Go over Expectation Form
Hand out Quia Passwords
Assign Quia Quiz on A1 - General Knowledge
Hand out flowchart 1.1
Get Hewitt textbooks
Go over rapid estimation problem of how many atoms are in the Sun
First asked for guestimates on answer.
Used circumference of Earth from definition of meter
Used diameter of Sun since ~100 Earths span the Sun
Derived tidal equation - used fact that Moon just covers Earth in total eclipse to show, for Moon and Earth that ratio of diameter to distance is the same. Ratio of tidal forces becomes ratio of densities. Moon is rock. Moon's effect on tides ~ 2.2 times that of Sun so density ~ 2.2 times that of Sun. Use density of Sun to be about 1.
Used value of mole to calculate number of atoms in Sun.
Introduction to uncertainties:
Handed out a block of aluminum to each student and asked them to find the density of that piece of metal.
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