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Page
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Item
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Possible Points
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Scoring Criteria
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8
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Data Sheet
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4
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1 pt: each pendulum measured correctly. Answer must include
seconds, length, and number of washers to earn a
point. However, answer does not have to have the correct
label (letter). Acceptable values:
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Pendulum
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Seconds
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Length
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Washers
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A
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9-11 or 18-22
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7.5-9
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1
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B
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9-11 or 18-22
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7.5-9
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4
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C
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13-15 or 26-30
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8-19.5
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1
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D
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13-15 or 26-30
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18-19.5
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4
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For seconds use either the left-hand range or the right-hand
range, but not both. Pick whichever side gives the student
the most points.
Use the letters of the two pendulums that took the most
time to swing for scoring page 5, item 1.
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5
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1
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2
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1 pt. each: for selecting or describing
the two pendulums that took the longest time. Normally these
will be C and D. If the student has labeled the pendulum differently,
then award points based on their labels for each long-string
pendulum they select. The pendulums they indicate must be
the ones with long strings. If they timed the short strings
wrong they do not get a point for selecting them.
Give one point if one answer is correct and the other is wrong.
If the data table is empty, award points anyway for indicating
C and D.
Do not penalize the student for data that are out of range
(e.g., length 6 inches) if the data table is consistent with
the experiment (i.e. the two short strings with 1 and 4 washers
take less time than the two long strings).
If the data table is jumbled (i.e., is not consistent) do
not give the benefit of the doubt to students who pick C and
D; only award points for picking pendulum that took longer
to swing. |
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5
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2a
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1
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1 pt: Pat is correct
If blank, check in 2b to see if answer is there. Award a point
for "length" or any phrase that was part of what
Pat actually argued. |
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5
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2b
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2
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1 pt: saying the length of the string is important, e.g.,
the long string swings slower, etc.
1 pt: saying the number of washers is not important
OR all of the following
(a) saying the number of washers is important
(b) this statement is supported by the data table
(c) saying it is less important than the length of the string
Note: two points can be awarded for a response that just
compares two pendulums if it describes the roles of both
length and weight (e.g.) long string with 4 washers was
slower than short string with 4 washers)
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5
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3a
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1
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1 pt: choice B (less time than any other pendulum). |
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5
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3b
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2
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1 pt: saying the string in E is the shortest. "Short
string" is not acceptable.
Use response to 3a to determine meaning of "shorter."
If the student chose B then describing the string as "shorter"
is acceptable. If the student chose an in-between answer,
then "shorter" may not be acceptable if it implies
shorter than one but not necessarily shorter than the other.
1 pt: saying the number of washers in E is not important
OR all of the following:
(a) saying the number of washers in E is important,
(b) this statement is supported by the data table
(c) saying it is less important than the length of the string.
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6
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4
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2
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1 pt: Yes
1 pt: if the line is not at the center, the pendulum can
be swinging and not cross the line (e.g., "if you put
it too close the washer might not reach all the way,"
"that's where it will cross the most, etc.)
Do not give a point for "it would be even" or
for comments about the time not being the same.
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Instructions: Circle the number of points awarded
for each question.
