Let's Twist

Maxine Edwards and Mary Teal
The Center for Advancement of Teaching

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Let's Twist
Lesson Plan
Algebra 1 Level

1. Have students stand in a large circle . Try to keep all students equal distance from the instructor who is standing in the middle of the circle.
2. Give each student a piece of black construction paper with white letters pasted to it. Give the paper to the students FACE DOWN, so that the students do not know what the word is. Student should also have writing utensil and the attached data sheet.
3. The instructor will stand in the center of the circle holding a light source with a dimmer switch attached to it. Initially the light should be set at the lowest level of light.
4. Turn off classroom lights.
5. Students should turn their construction paper over to be face up.
6. The instructor should begin counting ( as evenly as possible to simulate passing seconds), beginning with 0 and ending with 29. With each increase in numeric value, the light intensity should increase. At the number 9, the light should be at its highest intensity. As the instructor continues to count, the light intensity should decrease, reaching its lowest level at 19. The instructor should continue to count, increasing the intensity to its fullest, to the maximum of 29. (Note: Since this experiment deals with light intensity, it is important that the instructor be seated with the light source unblocked for all students)
7. As the instructor counts, using the data sheet, the students should individually record either Y or N at each number level to determine if they are able to read the written words or letter on their piece of construction paper. Each student should have a list of 30 numbers and answers at the end of the experiment.

1. Perform experiment as follows:
   Equipment
   light probe
   EA-100
   CFX-9850G
   flashlight with adjustable beam capabilities (Ex. STREAMLIGHT,JR)
   meter stick
   Data communication cable
   
   • Connect the light probe into CH1 of the EA-100.
   • Align the light probe with the center of the light source approximately 30cm apart. Turn on the flashlight to check alignment.
   • To operate the EA-100 manually, use the following keystrokes

   KEYSTROKE 			EXPLANATION
   a.  Press[SHIFT][MODE]		"Set-up"
       b.Press [DATALOG] until "5 Sec" appears	"Next"  Press [DATALOG] several
       times until the sample time you want
       appears (5 Sec)
   c.  Press[TRIGGER]		Chooses the 5 Sec as the time
   d.  Press[DATALOG] until
    
      "50" appears			Press [DATALOG] several times until 
       the number of sample points you want 
       appears (50)
   e.  Press[TRIGGER]		Chooses 50 as the number of samples
   f.    Press [DATALOG] until 1 appears	"Next" Press [DATALOG] until you see 
   	the time consideration you want.  In this
   	case, the time will be collected as data.
   g.   Press[TRIGGER]		Selects time consideration.
   h.   Press[TRIGGER]		Begins sampling.  This means to begin 	decreasing and increasing the amount 	of light of the flashlight.
   

   • As soon as the student presses TRIGGER, begin changing the beam of light to Brightest - Dimmest - Brightest as many times as possible until the sampling is complete.
     
   • Sampling is completed when the EA-100 displays DONE.
     
2. Retrieve the data from the EA-100:
   a. Connect EA-100 to CFX-9850G using the data communication link.
   b. Turn on CFX-9850G and choose Run (1) from the menu.
   c. Press SHIFT VARS {PRGM}
   d. Press F6 (>) , then I/O {F4}
   e. Press Recu (F4) {Receive( }
   f. Press OPTN, List {F1}, List {F1} ,1, close Parenthesis { ) }
   g. Press SHIFT EXE {¿ }
   h. Press Recu (F4) {Receive( }
   i. Press OPTN, List {F1}, List {F1} ,2, close Parenthesis { ) }
   j. Press EXE
   
3. The data should now be listed in List 1 and List 2.
   
4. For the next part of the procedure you will be operating in the STAT menu
   e. After entering the STAT menu, you should find List 1 and List 2. Press GRAPH {F1}
   f. Press SEL {F4}
   g. StatGraph 1 : DrawOn
   h. EXIT
   i. Press SET {F6}
   Graph Type: Scatter
   Xlist : List 1
   Ylist : List 2
   Frequency : 1
   Mark Type : ×
   Graph Color: CHOICE
   f. EXIT
   g. GRPH 1 {F1}
   Evaluate: Students will write and explain the intensity of the light with respect to the time the light is recorded. Also the students will be able to explain the relationship of the x and y axis and why the data is only in the first quadrant. Students will explain the relationship of the intensity of the light and the wattage of the light source. Further experiments could be conducted by changing the wattage of the light source . The students will be given new data and asked to create a new scatterplot graph and draw the line of best fit.

   
   
   Developed by:
   Maxine Edwards and Mary Teal
   Butler High School Matthews, NC
   
   additional help from:
   Neal Farley
   Independence High School
   Charlotte, NC