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Variables Module
Investigation #1
Date Activity Page #
8-14-07 Pendulums/Swingers 4
How many cycles will a 38 cm pendulum complete in
15 seconds with
the mass of one penny?
My 38 cm pendulum will swing ______ times in 15 seconds with the mass of
one penny.
1. pendulum/swinger2. timer
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.
Test ## of
completed cycles
12
3
Average
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.
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
What variables affect the number of cycles your
pendulum will complete in 15 seconds?
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?
SwingersInvestigation 1
Part 2
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?
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 _______________.
1. pendulum/swinger2. timer3. pennies
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.
Release of Position
Test #Angle of Release Number of Cycles
And Average
1 45 degrees ___, ___, ___ =
2 90 degrees
3 180 degrees
Change of Mass
Test # MassNumber of Cycles
and Average
1 2 pennies ___, ___, ___ =
2 small washer
3 large washer
List the variables that were used and what you determined from the
results.
Investigation 1 Part 3
How will the length of the pendulum affect the number
of cycles a pendulum will complete in 15 seconds?
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 _________________.
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
The number of cycles completed in 15 seconds ________ as the
pendulum length increases,
and it __________ as the pendulum length decreases.
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.
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?
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