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• How many cycles do you think a pendulum will make in 15 seconds?
• Cycle = swing away from you and back• Pendulum = mass hanging from a fixed point
that is free to swinger to and fro
Form a Hypothesis
• “I think that the swinger will swing ____ times in 15 seconds.”
• “I think this because…”
Test the Hypothesis
• Part 1 – Swingers is out of you Variables FOSS kit.• Materials needed for each group:– String (50cm)– Tape– Pencil– Paperclip– 1 penny– No. 3 Sheet: How to build a swinger? (out of your FOSS
booklet)– Lab report sheet
Test the Hypothesis con’t.
1. Pair up the students.2. Make the swinger.3. Tape a pencil so that the eraser end is hanging off of
a desk.4. Practice releasing the swinger so that it is horizontal
with your desk. 5. One partner releases and counts the other watches
the clock and starts/stops the investigation.6. Repeat the process 3 times.
Collect Data
• On the lab report sheet record the number of cycles that the pendulum swung for each trial.
Trial 1 Trial 2 Trial 3 Average
Swinger
Analyze Data
• Create a graph using the table with data.• Label the x-axis (independent variable = Trial
1, Trial 2, Trial 3).• Label the y-axis (dependent variable = number
of swings).• Determine the increments that you want to
use for the y-axis.
Conclusion
• What did you learn about the number of cycles that a pendulum will swing in 15 seconds?
• “My conclusion was that the pendulum swung ____ many times. My hypothesis was correct/incorrect because it actually swung ____ many times.”
Inquire Further
• Do you have any more questions?
• Could you do another experiment and change only one variable?
• Possible answers:– Change the length of the
swinger.– Add additional mass.– Do if for a longer amount
of time.