Transcript CPO Science Integrated Physics & Chemistry Chapter 11.1
CPO Science Integrated Physics & Chemistry Chapter 11.1
Harmonic Motion
Developing A Model
What does harmonic motion mean?
What are some examples of harmonic motion?
What is the difference between linear motion and harmonic motion?
Key Questions
What is harmonic motion?
How do we describe the back and forth motion of a pendulum?
Developing An Experiment
What variables effect the pendulums period?
— Mass, amplitude, and length — How can we change the variables?
What material will we need?
What data needs to be collected?
— Period, How can we calculate period?
2 times the timer — Length, mass, and amplitude
Run The Experiment
Set up the Pendulum
Tips:
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How many variables can you test at a time?
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If you think one variable may effect the period, test it first to the extreme.
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Work as a group to help keep variables constant.
What did you learn?
What did you discover about the three variables?
Why didn’t mass and amplitude affect the period?
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Mass gravity is constant
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Amplitude conservation of energy
Graph the data that you have
What did you learn?
Developing An Experiment
Why does the amplitude change during the experiment?
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Friction
Where does the friction come from?
We call the friction in harmonic motion damping
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Have you ever experienced damping?
How long does damping take in the pendulum?
What Did You Learn?
What did you discover about the two variables?
What would you want to have in order to reduce the effect of damping?
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Large mass & long length
Graph the data that you have
Summary
What is harmonic motion?
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Is a pendulum harmonic motion?
How do we describe the motion of the pendulum?
What affect does damping have on the pendulum
?