1. Pendulum Investigation

2. Inquiries/Activities Folder - 1.4

3. What other “factors” might affect a planet’s period of revolution?
The farther a planet is from the sun, the longer its period of revolution is.
What other “factors” might affect a planet’s period of revolution?
What About Mass?

4. Pendulum Motion vs. Planetary Motion

5. A weight suspended from a pivot so that it can swing freely
What is a Pendulum?
A weight suspended from a pivot so that it can swing freely
A to C to A = 1 period

6. P2 = a3 Comparing Equations For Planetary Orbits For Pendulums
Period of Pendulum
Period of a planetary orbit
P2 = a3
Length of semimajor axis
Length of Pendulum
For Planetary Orbits
For Pendulums

7. Acceleration due to Gravity Gravitational Constant
G vs. g
Acceleration due to Gravity
Can you find it during
this lab?
g = 9.8m/s2 (on Earth)
Gravitational Constant
Used to find the force of gravity between 2 objects.
G = 6.67×10−11 N·(m/kg)2

8.  Lab is on Ultranet  Introduction Inquiry Questions Materials Needed
Hypotheses, Variables & Data Tables
Must get signed!
Procedure
Task #1 – Period vs. Mass
Task #2 – Period vs. Length
OPTIONAL Extension – Period vs. Angle
Graphing & Conclusion

9. Example Data Tables on the Board
Period vs. Mass
Mass
Trial #1
Trial #2
Trial #3
Trial #4
Trial #5
Average
Independent Variable:
Dependent Variable:
Controlled Variables:
Period vs. Length
Mass
Trial #1
Trial #2
Trial #3
Trial #4
Trial #5
Average
Independent Variable:
Dependent Variable:
Controlled Variables:
You need to make your OWN in your notebook!

10. Pendulum Inquiry Schedule
Day 1
Day 2
Day 3
Introduce Inquiry
(Start Getting Data)
Work Day
(Finish Getting Data, Start Graphing & Writing Conclusion)
Graphs & Conclusion Paragraphs due End of Lesson!
Wednesday,
3th August
These are SUMMATIVE assessments so the graphs and conclusion MUST be turned in individually!

11. EACH Person Needs to Turn in…
2 Data Tables - Typed
2 Graphs – Excel or hand drawn
1-2 Conclusion paragraph(s) - Typed

12. What do I need to do before I start collecting data?
Identify the Variables (for both Mass & Length)
Independent
Dependent
Controlled
Make Hypotheses (for both Mass & Length)
Make Data Tables (for both Mass & Length)
* Show Mrs. Johansen all of the above to get your materials

13. What should I include in my…
…Graph
Labeled x & y-axis.
Appropriate units (ie. seconds, cm, liters, etc)
Title
Line of best fit
…Conclusion Paragraph
Describe what trends you see in your data.
Was your hypothesis supported or not? Explain using the data that you collected.
Describe and explain where you or your partner(s) might have made mistakes collecting the data.
Use your results to compare the period of a pendulum to the period of a planet.
Give possible improvements that you would make when collecting data if you were to perform this experiment again.
Ms. Lee will be giving a “Mini-lesson” on Excel

14. hypothesis

15. EACH Person Needs to Turn in…
2 Data Tables - Typed
2 Graphs – Excel or hand drawn
1-2 Conclusion paragraph(s) - Typed
MUST Be turned in at the END of the Lesson!
Work on Unit 1 Revision when you are done.