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Ethnobotany at Pwunso: Gymnosperms, spice trees, timber

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Bus arrival at Pwunso was 15:54. This would impact the end time. The class began at the Ficus prolixa and by 16:03 was headed to the Syzygium aromaticum. From there the usual circuit was followed: Araucaria columnaris, Cinnamomum verum, Cycas, Piper nigrum, Coffea robusta (the last having fallen over recently), and Myristica fragrans (16:16). Myristica fragrans is still the time consuming stop and the class headed to the Eucalyptus deglupta at a late16:28. Eucalyptud deglupta  Having seen high school students come up the road from the back gate, I jogged ahead to see if the back gate might be open. The gate was not, which cost time. Perhaps there is a gap in the fence line. Unlikely that the students hopped the fence - some were wearing school skirts. Perhaps the gate was locked after the school commute.  Shirleven, Carmegarose, Geneva 16:31 reversing course to go around to the tennis courts. Anastasia, Ne...
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Botany laboratory five: Pwunso

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An early arrival permitted a scan of what to see and what to skip.  Averrhoa carambola This term the mid-garden was skipped as there were no fruit either on the Averrhoa bilimbi or the Garcinia xanthochymus. On time arrivals awaiting the bus at 11:34 including Sweethy, Susan, and Mirabella. Santriko and Harston. The bus didn't roll out from the LRC until 11:15, arriving at 11:35. The morning had been rainy, with a shower at 10:45, but for the rest of the field walk the rain held off. Cassia fistula in bloom  The field walk began at the Ficus prolixa. This was a dual coverage walk for the five students in botanyj and ethnobotany. A sixth ethnobotany only student joined the botany section walk.  Amaryssa, Lensilee , Beverly, and Lyviane Susan and Harston  Alex Geminaro Cinnamomum verum  After a visit to the western end of the garden, the class vi...
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050 RipStik force is change in momentum

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The class opened in A101 with Newton's definition of force as the change in momentum. Then the demonstration was diagrammed.  The numeric values were added after the two RipStik runs.  This term two timers timed the change in momentum and two timers timed the 1.8 meter final velocity speed trap. The only measurement is the 1.8 meter speed trap. Once again the spring scale was attached to jute tied to a post partway up the slope. The downslope force was measured at ten to twelve Newtons. The runs began at the first post the sidewalk intersection. The distance is roughly 21 meters to the bottom end of the speed trap. The calculations were all made on the white board, the Smartboard was not used nor was the spreadsheet. The spreadsheet was updated after class. The difference of 4% is vanishingly small relative to past differences.  Students timed both the change in momentum time and the speed...
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4.3 RipStik swizzle frequency versus velocity

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At 8:50 a ten meter length of sidewalk was marked with chalk. Cold open on the sidewalk. Data was then gathered until around 9:20.  Kerryanne completed three runs across the ten meter distance Data gathered in a spreadsheet .  The data well illustrates a system that is roughly linear between one and three Hertz, but not perfectly linear. This data will also be used in section 4.4. 
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045 Ball roll on student union ramp

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The theory outlined on the board at the start of class. Homage to trigonometry survivors Gear Location Ramp view Desmos The speed obtained from d₁~½a₁t₁² and v₁ = a₁t₁ was 3.35 meters per second. The conservation of energy result of v₂=√(2g₁h₁) predicted 6.79 meters per second using the class measured mean acceleration of gravity of 9.48 meters per second squared. 
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Hot wheels conservation of energy

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The Hot Wheels variant of this laboratory is functionally more complex and takes much longer to set up. There are many moving pieces. And the results were surprisingly inconsistent. The folding chairs approach was used to mount the ramps but with the chairs on the sinks instead of the table to gain more height. The center table was set up with a 174 cm speed trap to measure velocity. Jaysleen opens the new box of Hot Wheels cars. A timing start mark was made on the ramp where the height was effectively zero. The track as viewed from the front. This was 8:50 AM and data recording had not yet begun. The track took that long to set up - from a start at 7:45. The track plus the board notes and the demonstration runs.  The board notes as recorded after class. DeAnne and Alisha gathering data.  As more students arrived, they decided to set up a second dual track. Tikikos working on fixing...
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