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Title:
World Famous
Marble Lab
Purpose:
- to record data
for repeated trials of an experiment
- to determine
the unknown size of an object without direct measurement
Materials:
- 7 spheres (marbles)
- meter stick
- masking tape
Procedure:
- Use masking tape
to make a line approximately 60 cm long across lab table
- Measure and record
the exact length of the line in cm in data table
- This line is
the field
- Place 6 spheres
along the marked line (field)
- Place the remaing
sphere about 1 meter away from the lined up spheres
- Withoutlooking,
1 partner will rool the single sphere toward the line of spheres
- The other partner
will note on a separate sheet of paper if the marble hits or misses
- A hit sphere
will then be replaced in position
- Repeat for 100
trials per partner
- Switch for each
of 4 partners....total of 400 trials
- Record data in
data chart and in class chart on board
- Fill in data
chart below
- Get "actual
value" from teacher
Results:
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Observations
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Group
Data
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Class
Data
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width
of field
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number
of target spheres
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total
number of hits
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total
number of trials
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calculated
sphere diameter (cm) *
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actual
diameter of sphere (cm)
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_______Field Width x Number of Hits________
2 x number of target spheres x number of trials
Actual
Value - Observed Value x 100%
Actual Value
Discussion:
- Were there
more hits or misses in your own trials?
- On what does
the hit/miss ratio depend?
- Were the group
or class average results closest to the actual value?
- What would
have happened to your data if the size of the spheres were twice
as large? Half as large?
- How does the
number of trials affect the results?
Conclusion:
- (A one sentence
testable statement that follows from your results, what you did, what
you observed)
- For this activity
comment on marble size ............
Reflection:
- (A personal
statement about the activity, whether it relates to "real life," whether
you liked it, suggested improvements.....)
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