We are nearing the end of the 3rd Quarter! Make sure that you look up your grades on Edbox and see if you are missing anything. The deadline for Late Work and Extra Credit is Monday 4/9 by 3:30 pm.
Tues 4/3: Go over 12+13 Review Problems (see answers in previous post). Jeopardy Review. Work on Instrument Project.
Thurs 4/5: Demonstrate Musical Instruments. Turn in 12+13 Review. Take 12+13 Test. Turn in Musical Instrument Write-Up.
Mon 4/9: Deadline for Late Work and Extra Credit is today by 3:30 pm. Electromagnetic radiation and EM spectrum. Reflection and mirrors.
Wed 4/11: Mirror Equation. Lenses and lens lab. Lens equations.
Friday 4/13: Teacher Work Day. No School.
Saturday, March 31, 2012
Answers to 12+13 Review Sheet (for test on Thursday 4/5)
1. 0.0055 m
2. 4 nodes (we'll draw in class)
3. 1/9
4. 0.25 W
5. 180 Hz, 540 Hz, 900 Hz
6. 100
7. 5.01 W/m^2
8. 0.20 s
9. 285!
10. 3000 Hz (2 sig figs)
11. 4.0 Hz
12. 27.9 N
13. 4.07 s
14. 17.5 m/s^2
15. 105
2. 4 nodes (we'll draw in class)
3. 1/9
4. 0.25 W
5. 180 Hz, 540 Hz, 900 Hz
6. 100
7. 5.01 W/m^2
8. 0.20 s
9. 285!
10. 3000 Hz (2 sig figs)
11. 4.0 Hz
12. 27.9 N
13. 4.07 s
14. 17.5 m/s^2
15. 105
Monday, March 12, 2012
March 7-March 23
- Wed 3/7: Introduce types of waves. Start Ripple Tank Lab.
- Fri 3/9: Color-mark 2nd draft of Spring Lab. Finish Ripple Tank Lab.
- Tue 3/13: Wave properties. Sound properties. Start problems. Really finish the Ripple Tank Lab. Final Draft of Spring Lab due Thursday.
- Thur 3/15: Turn in Final Draft of Spring Lab and Color-Marked version. The Doppler Effect and Sonic Booms.
Resonance. Tacoma Narrows Bridge. More problems (7-13). - Mon 3/19: Resonance. Tacoma Narrows Bridge. Harmonics. Speed of Sound Lab. Harmonics problems.
- Wed 3/21: Computer Sound Lab. Musical Instrument Project. Simple Harmonic Motion. Spring and Pendulum problems.
- Fri 3/23: Check off problems. 12+13 Review. Musical Instrument due on Tues 4/3 or Thurs 4/5. 12+13 Test on Thursday 4/5.
Wednesday, February 29, 2012
Computer Lab Graphing for Pendulum Lab
Before you begin, you should calculate the averages and uncertainties for all of your trials for period. In addition, you should divide by the number of swings so that your average periods are for just one swing.
Make 2 graphs: one of Period vs. Mass and another of Period vs. String Length. Besides all of the usual components of a good graph, include uncertainties in your graphs, draw a line of best fit (unclick "connect points"), and include an annotation.
Finally, look at the String Length Graph and determine the shape of the line. If it looks like a straight line, you may simply find the slope of the line. If it looks like an exponential (x squared), square the lengths of the string and enter those as an additional column in your data table. If it looks like 1/x, calculate 1/length for your 5 lengths and enter that in an additional column. Whatever the function, do that function to the length data and enter it as an additional column.
Now make a 3rd graph that plots period vs. the modified data (the additional column). If you picked the correct function, this technique should "straighten out" the line and you can find the slope of that new line. You will now be able to write a "master equation" for the period of the pendulum. For example if your original length data looked like an x squared function and the slope of your 3rd graph is 7.14, your master equation will look like this: T = 7.14 L^2 (only string length is squared). Finally, you can check your "master equation" to make sure that it actually works for your data for period and string length. Good luck!
Make 2 graphs: one of Period vs. Mass and another of Period vs. String Length. Besides all of the usual components of a good graph, include uncertainties in your graphs, draw a line of best fit (unclick "connect points"), and include an annotation.
Finally, look at the String Length Graph and determine the shape of the line. If it looks like a straight line, you may simply find the slope of the line. If it looks like an exponential (x squared), square the lengths of the string and enter those as an additional column in your data table. If it looks like 1/x, calculate 1/length for your 5 lengths and enter that in an additional column. Whatever the function, do that function to the length data and enter it as an additional column.
Now make a 3rd graph that plots period vs. the modified data (the additional column). If you picked the correct function, this technique should "straighten out" the line and you can find the slope of that new line. You will now be able to write a "master equation" for the period of the pendulum. For example if your original length data looked like an x squared function and the slope of your 3rd graph is 7.14, your master equation will look like this: T = 7.14 L^2 (only string length is squared). Finally, you can check your "master equation" to make sure that it actually works for your data for period and string length. Good luck!
Wednesday, February 22, 2012
Answers to 7+8 Review for test on Friday 2/24
15. 9500 N 16. 1.0 Nm 17. 0.30 m 18. 0.44 m 19. 18 kg m^2 20. 0.25 kg m^2/s 21. 25 kgm^2/s 22. 1.9 rad/s
Tuesday, February 21, 2012
2/22-3/5/2012
- Wed 2/22: Hand-out 7+8 Review and work on it. Introduce Machine Project and work on it.
- Friday 2/24: Demonstrate Machines. Turn in 7+8 Review. Take 7+8 Test.
- Tuesday 2/28: Introduce Simple Harmonic Motion. Pendulum Lab.
- Thursday 3/1: Computer Lab to do Pendulum Graphs. Introduce Spring Inquiry Lab. Write problem statement, background, hypothesis, variables, procedure.
- Monday 3/5: Take data for Spring Inquiry and process data. Bring in full write-up to be color-marked on Friday 3/9.
Sunday, February 19, 2012
Rolling Balls Lab Write-Up
This is what you need for the Rolling Balls Lab, due Wednesday 2/22:
1) Neat well-labeled data table with units (you may include calculated values) Make sure that you include all 5 trials and the average for each object
2) Calculations: Final Velocity, Final Angular Speed, Potential Energy, Translational KE, Rotational KE. All values should be calculated for each object, but you only need to show a sample calculation for each type once
3) Check conservation of energy. For each object, complete the equation: mgh = 1/2 mv^2 + 1/2Iw^2
4) Answer Questions A, B, C, D. Make sure that you use data to back yourself up!
1) Neat well-labeled data table with units (you may include calculated values) Make sure that you include all 5 trials and the average for each object
2) Calculations: Final Velocity, Final Angular Speed, Potential Energy, Translational KE, Rotational KE. All values should be calculated for each object, but you only need to show a sample calculation for each type once
3) Check conservation of energy. For each object, complete the equation: mgh = 1/2 mv^2 + 1/2Iw^2
4) Answer Questions A, B, C, D. Make sure that you use data to back yourself up!
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