1. Variables Module Investigation #1

2. DateActivityPage # 8-14-07Pendulums/Swingers4

3. How many cycles will a 38 cm pendulum complete in 15 seconds with the mass of one penny?

4. My 38 cm pendulum will swing ______ times in 15 seconds with the mass of one penny.

5. 1. pendulum/swinger 2. timer

6. 1.Construct a 38 cm pendulum. 2.Swing the pendulum and record how many cycles it completes in 15 second 3.Complete #2 three times and average your results.

7. Test # # of completed cycles 1 2 3 Average

8. If a penny is placed at the end of a 38 cm pendulum made out of string and a paper clip, then it will complete ______cycles in 15 seconds.

9. 1.Pendulum – a mass hanging from a fixed point that is free to swing back and forth 2.Cycle – any motion or activity that repeats itself 3.Variable – anything that you can change in an experiment that might affect the outcome

10. What variables affect the number of cycles your pendulum will complete in 15 seconds?

11. 1.What would happen if you changed the release position of the pendulum? 2.What would happen if you changed the mass of the pendulum? 3.What would happen if you changed the length of the pendulum?

12. Investigation 1 Part 2

13. 1.How will the release of position of the pendulum affect the number of cycles a pendulum will complete in 15 seconds? 2.How will changing the mass of the pendulum affect the number of cycles a pendulum will complete in 15 seconds?

14. 1.If I change the release of position, then the number of cycles will_________ because _________. 2. If I change the mass of the pendulum, then the number of cycles will _____________ because _______________.

15. 1. pendulum/swinger 2. timer 3. pennies

16. 1.Swing the pendulum at the determined position of release and record how many cycles it completes in 15 second. 2.Complete #2 three times and average your results. 3.Swing the pendulum with the new mass and record how many cycles it completes in 15 second. 4.Complete #2 three times and average your results.

17. Release of Position Test # Angle of ReleaseNumber of Cycles And Average 145 degrees___, ___, ___ = 290 degrees 3180 degrees

18. Change of Mass Test #Mass Number of Cycles and Average 12 pennies___, ___, ___ = 2small washer 3large washer

19. List the variables that were used and what you determined from the results.

20. Investigation 1 Part 3

21. How will the length of the pendulum affect the number of cycles a pendulum will complete in 15 seconds?

22. I predict that the number of cycles completed in 15 seconds will _________ as the pendulum length increases, and it will __________as the pendulum length decreases because _________________.

23. Length of the Pendulum # of cycles completed in 15 seconds 10 cm 17 cm 22 cm 30 cm 45 cm 55 cm 70 cm 90 cm 120 cm 170 cm

24. The number of cycles completed in 15 seconds ________ as the pendulum length increases, and it __________ as the pendulum length decreases.

25. 1.Name three things that you have learned while doing this investigation. 2.Name two things that surprised you during this investigation. 3.Name one question that you have now that you have completed this investigation.

26. 1.What is a variable? 2.What is a pendulum and where have you seen one? 3.What variables might affect the number of cycles the pendulum makes in 15 seconds?