Tell me about a job or situation where bad data could cause big
trouble. Explain why it would be so bad.
Vertical Motion Lab
Labs
We’re going to keep working on our lab today where we’ll
measure the strength of gravity. Let’s continue with our
data.
Answer analysis questions 5 through 10 while looking at
the graph and data of one of your trials you consider to
be a “good” one
Graphing Motion Lab
Pre lab
questions
1) How will you know if your data is
good (valid) or bad (invalid)?
2) How will you know what to keep and
what to throw away? What are you
looking for?
3) What can you do to improve the
validity of your data?
4) What is the value of collecting data
from other groups and using it to
calculate an average?
Graphing Motion Lab
Analysis
4) How did you do? Did you keep all of
the data you collected? Why or why not?
5) What is your average value for the
acceleration for gravity.
6) What does this number represent?
Explain in your own words as best as
you can. Talk to a neighbor about it!
7) Compare your value to the accepted
value 9.8 m/s2. How does it compare?
Is it close? What’s close enough?
Graphing Motion Lab
Analysis
5) How does velocity change over time
during your tests?
6) Describe the line on the distance
graph. Draw an example of the graph
7) What does this mean about the
speed?
8) How does acceleration change over
time during your tests?
9) Describe the line on the velocity
graph. Draw an example of the graph.
10)What does this mean about
acceleration?
Graphing Motion Lab
Conclusion
Look back at your hypothesis and explain
if your predictions were right or wrong.
Use the data to prove what you’re
saying.
After that, tell me what you’ve learned
about data collection and how we know if
data are good or bad.
Graphing Motion Lab
Purpose
-To determine the constant for the
acceleration of gravity.
- To learn how to interpret data.
Hypothesis
- An object will [slow down]
[stay the same speed ]
[speed up] as it falls.
- So its acceleration will [ decrease ]
[ stay the same ]
[ increase ]
Materials
Motion detector, graphing software, book
Exit Question #15
2.9a
What does the constant for gravity represent?
a.
b.
c.
d.
e.
f.
The fastest speed anything can fall
The amount of mass in an object
The rate at which things speed up as they fall
How hard any 2 objects pull on each other
Gravity on all the planets in the solar system
There is no constant for gravity
Exit Question #16
1.4a-b
Which of the following traits must be balanced with
skepticism?
a.
b.
c.
d.
e.
f.
curiosity
doubt
honesty
rationality
open-mindedness
bias