Pendulum Investigation

Inquiries/Activities Folder - 1.4

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?

Pendulum Motion vs. Planetary Motion

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

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

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

 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

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!

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!

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

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

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

hypothesis

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.