springs and swings: hands-on discovery welcome!. who is cpo science? developer and publisher of...
TRANSCRIPT
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Springs and Swings:Hands-on Discovery
Welcome!
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Who is CPO Science?
• Developer and publisher of inquiry-based science curriculum and hands-on materials• How many have heard of CPO Science?• Sample materials at your table – PLEASE LEAVE FOR OTHER WORKSHOPS – WE CAN MAIL SAMPLES – Thanks very much!
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How is CPO Science Different?• We design and manufacture high quality
science equipment and INCLUDE IT with purchase of textbook sets
• We support guided inquiry through extensive teacher support material and reader-friendly texts
• We offer strong science content that is a blend of conceptual and quantitative approaches.
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What Subject Areas?• High School: Physical Science, Earth/Space
Science, Physics First, CP Physics• Middle School: Earth, Life, Physical• Visit the booth• Request samples with raffle forms at end of
workshop
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Now for the fun!
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What is a “spring constant” a measure of?
• Force per unit of extension or compression
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Which extension spring has a larger spring constant?
• You have a white-tabbed and a blue-tabbed extension spring
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Use the data table to guide you as you collect data for each spring
Extension (cm)
Forc
e (N
)
GRAPH DATA FOR BOTH
SPRINGS!
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What are the spring constants?
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Hooke’s Law (springs)
• Use your graph or the equation to predict how much the blue-tabbed spring would extend with 15 washers, then test your prediction
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Hmm…
• Why do you get an extension prediction that is higher than the experimental result if you use the Hooke’s Law equation?
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Collect data to graph and find the spring constant for the compression spring
Compression (cm)
Forc
e (N
)Create a graph!
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Let’s go from springs to SWINGS!
• Set up a pendulum
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Press and hold GO button to turn on the DataCollector
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Plug the photogate into Photogate A port
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Choose CPO Timer Mode
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Choose the period function in Timer Mode.
• Period is the time for one complete cycle. Since the pendulum breaks the beam once as it swings through a complete cycle, the DataCollector’s readout equals the time it takes the pendulum to complete one full cycle.
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Which has the biggest effect on the period: length, mass, or amplitude?
• Design an experiment to find out. Change each variable 3 times so you can create 3 graphs of 3 data points each. Take careful data, because you will compete against other groups in the accurate clock contest!
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Clock Challenge!
• Using your data, design and construct a pendulum that you can use to accurately measure a 30-second time interval. When it’s your group’s turn, you will demonstrate the accuracy of your clock by telling us when to stop a running stopwatch (that you cannot see!)
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Build an Oscillator!
• Use blue-tabbed spring• 7 washers• DataCollector:– CPO Timer Mode– Period function
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Natural Frequency
• Find the natural period • Calculate the natural
frequency
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Design another oscillator
• Build an oscillator that has a HIGHER natural frequency
• Build an oscillator that has a LOWER natural frequency