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Introduction to physics
SUBJECTIVE VS. OBJECTIVE
Subjective: outcomes are based on the tester’s
  feelings and opinions. (Used in the arts)
  ex: “I don’t like you because I think you’re ugly…”


Objective: a judgment based on fact, not on
  personal feelings or opinions. (Science must
  use this)
  ex: “I’ll buy this car because it gets the best gas mileage.”
SCIENTIFIC METHOD
1. Recognize a problem
2. Make and educated guess-a hypothesis-about the answer
3. Predict the consequences of the hypothesis
4. Perform experiments to test predictions
5. Formulate the simplest general rule that organizes your finding based
   on your hypothesis, predictions and results of experimentation


  We use this general method daily though we may not think of it


                         “WEAR THE PANTS”
VARIABLES IN EXPERIMENTATION
In any experiment, there can be many variables.
   The important thing is to only change one
   variable in an experiment at a time, if you want
   to isolate true cause and effect of
   experimentation.
THINK-PAIR-SHARE

Give an example of changing one
        variable at a time.
HOW GOOD IS A MEASUREMENT?
  “Mr. Basso, how well do I have to measure?”
           (story of the plumb-level)


      Accuracy vs. Precision
   (Think-pair-share: what’s the difference?)


      share your definitions on the board
PRACTICING ACCURACY
                              Think-Pair-Share


A block of brass that weighs 500 grams is weighed on a digital scale.
   Students practice their use of a scale. The students report their results:


Student 1: measures 497 grams
Student 2: measures 501 grams
Student 3: measures 503 grams
Student 4: measures 497 grams
Student 5: measures 496 grams
               Are these student’s measurements Accurate?
PRACTICING PRECISION
                            Think-Pair-Share
Students measure a length of wood with a measuring tape. It’s known
   measurement is 16’ 1-1/16” long:


Student 1: measured 16’ 1-1/8”
Student 2: measured 16’ 1-1/8”
Student 3: measured 16’ 1-1/16”
Student 4: measured 16’ 1-1/16”
Student 5: measured 16’ 1-1/8”


                       Are these students precise?
EXAMPLE OF ACCURACY AND PRECISION
EXAMPLE OF ACCURACY AND PRECISION
Accuracy: How close do you get to the actual measure/mark



Precision: Is the measurement repetitively close to each other
In science we need to try to be both accurate and
                     precise!

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Introduction to physics

  • 2. SUBJECTIVE VS. OBJECTIVE Subjective: outcomes are based on the tester’s feelings and opinions. (Used in the arts) ex: “I don’t like you because I think you’re ugly…” Objective: a judgment based on fact, not on personal feelings or opinions. (Science must use this) ex: “I’ll buy this car because it gets the best gas mileage.”
  • 3. SCIENTIFIC METHOD 1. Recognize a problem 2. Make and educated guess-a hypothesis-about the answer 3. Predict the consequences of the hypothesis 4. Perform experiments to test predictions 5. Formulate the simplest general rule that organizes your finding based on your hypothesis, predictions and results of experimentation We use this general method daily though we may not think of it “WEAR THE PANTS”
  • 4. VARIABLES IN EXPERIMENTATION In any experiment, there can be many variables. The important thing is to only change one variable in an experiment at a time, if you want to isolate true cause and effect of experimentation.
  • 5. THINK-PAIR-SHARE Give an example of changing one variable at a time.
  • 6. HOW GOOD IS A MEASUREMENT? “Mr. Basso, how well do I have to measure?” (story of the plumb-level) Accuracy vs. Precision (Think-pair-share: what’s the difference?) share your definitions on the board
  • 7. PRACTICING ACCURACY Think-Pair-Share A block of brass that weighs 500 grams is weighed on a digital scale. Students practice their use of a scale. The students report their results: Student 1: measures 497 grams Student 2: measures 501 grams Student 3: measures 503 grams Student 4: measures 497 grams Student 5: measures 496 grams Are these student’s measurements Accurate?
  • 8. PRACTICING PRECISION Think-Pair-Share Students measure a length of wood with a measuring tape. It’s known measurement is 16’ 1-1/16” long: Student 1: measured 16’ 1-1/8” Student 2: measured 16’ 1-1/8” Student 3: measured 16’ 1-1/16” Student 4: measured 16’ 1-1/16” Student 5: measured 16’ 1-1/8” Are these students precise?
  • 9. EXAMPLE OF ACCURACY AND PRECISION
  • 10. EXAMPLE OF ACCURACY AND PRECISION Accuracy: How close do you get to the actual measure/mark Precision: Is the measurement repetitively close to each other
  • 11. In science we need to try to be both accurate and precise!