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Sunday, February 2

  1. page 2014 Professional Development Conference edited 2013 2014 SDSTA/SDCTM Professional Notice: The copyright law of the United States (Title 17, U.…
    20132014 SDSTA/SDCTM Professional
    Notice: The copyright law of the United States (Title 17, U.S. Code) governs the reproductions of copyrighted material; the person posting to this wiki is liable for any infringement. SDCTM/SDSTA is not liable for copyrighted material and will remove any material upon written request.
    Please click on the session number on the side bar to view a session.
    (view changes)
    4:03 pm

Tuesday, February 12

  1. page Session 107 Magic Squares with Mental Math edited Magic Squares with Mental Math Presenter: Marvin Gamble USD Marvin.Gamble@usd.edu I will demon…
    Magic Squares with Mental Math
    Presenter: Marvin Gamble
    USD
    Marvin.Gamble@usd.edu
    I will demonstrate how to make a 3 X 3 magic square and solve the magic squares. Also, I will make a 4 X 4 personal magic square and do mental multiplication mathematics with proofs.
    {Magic Squares SD.pptx}
    {Magic Squares SD.pdf}

    (view changes)
    5:34 pm
  2. 5:34 pm
  3. 5:34 pm
  4. page Session 56 edited ... {HydFlower.JPG} Hydrophobic Flower {a2.jpeg} Catching Fire Hydrophobic Flower First Place …
    ...
    {HydFlower.JPG} Hydrophobic Flower
    {a2.jpeg} Catching Fire
    Hydrophobic Flower First Place
    In this photo I made a flower out of hydrophobic sand and put water droplets on it. Hydrophobicity occurs when the functional group of a compound is nonpolar. The molecule becomes hydrophobic when a nonpolar molecule is attached to the end of the compound. So if the compound’s surface comes in contact with the water, the water will slide off because there are no attractive forces shared between the two surfaces. The surface tension of the droplets creates a very round drop instead of a flatter drop. On a hydrophilic surface, it “hugs” more of the water because the surface is water loving, but on the hydrophobic surface it is different. The internal contact angle on the hydrophobic surface increases because the cohesive forces between the water molecules make it take on a spherical shape.
    It was not until I printed this picture that I noticed the water droplets on the hydrophobic sand create a convex lens and magnify the sand under the droplets. The water droplets then create a magnified virtual image. When the object is between a convex lens and its focal point, the light rays from the object diverge when they pass through the lens. The brain interprets these diverging rays as coming from an object directly along the path of the rays that reach the eye. This creates a magnified virtual image on the same side of the lens as the object.
    "Catching Fire"(Natural) Second Place
    This picture was taken as water droplets fell from an icicle into a sunset. This is an example of total internal reflection. When the light hits the drops of water, it is bent due to differences in the refractive index between water and air. Once in the drop, a portion of the light is unable to cross the water/air boundary and is reflected back internally. This light cannot escape since the angle of incidence is greater than the critical angle. The result is dripping "fire".
    {MouseTrapCar.JPG} MouseTrapCar
    {LaserMania.JPG} Laser Mania
    ...
    Trap Car Third Place
    A mousetrap car is a small vehicle that is powered by the spring of the mousetrap. The mousetrap car utilizes a lever, a spring, and wheels and axles. When the mousetrap is set and a string is wound around the axle, the car has elastic potential energy. When the trap is tripped the elastic potential energy of the spring is converted to the rotational movement of the lever arm that is attached to the spring. Fishing line is connected to the end of the lever arm and is wrapped around the back axle. As the lever arm moves around the arc of the spring it pulls on the fishing line applying a torque to the axle. The axle is connected to the back wheels. Strips of a balloon are wrapped around the back wheels to supply the friction to get the car going. As the spring releases, the elastic potential energy is turned into kinetic energy, which moves the car forward. Once the trap has snapped shut and the string is unwound from the axle completely, the momentum of the car keeps it moving forward until friction between the wheels and the floor and air resistance cause it to stop.
    Laser Mania
    (view changes)
    4:34 pm
  5. page Session 33 Metric Madness edited {metricmadness article.pdf} {KroonMetricMadnessHandout2013finalfeb1.pdf} {Metric Olympics Eve…
    {metricmadness article.pdf} {KroonMetricMadnessHandout2013finalfeb1.pdf}
    {Metric Olympics Event Guidelines final.pdf}
    {KroonMetricMadnessHandout2013finalfeb1.pdf}
    (view changes)
    8:36 am
  6. page Session 98 Metric Madness edited Metric Madness handouts will be added soon! {KroonMetricMadnessHandout2013finalfeb1.pdf} {Metr…
    Metric Madness handouts will be added soon! {KroonMetricMadnessHandout2013finalfeb1.pdf}
    {Metric Olympics Event Guidelines final.pdf}
    {metricmadness article.pdf}

    (view changes)
    8:35 am
  7. page Session 33 Metric Madness edited {KroonMetricMadnessHandout2013finalfeb1.pdf} {metricmadness article.pdf} {KroonMetricMadnessHan…
    {KroonMetricMadnessHandout2013finalfeb1.pdf}{metricmadness article.pdf} {KroonMetricMadnessHandout2013finalfeb1.pdf}
    {Metric Olympics Event Guidelines final.pdf}
    (view changes)
    8:33 am
  8. page Session 33 Metric Madness edited Metric Madness handouts will be added soon! {KroonMetricMadnessHandout2013finalfeb1.pdf} {Metr…
    Metric Madness handouts will be added soon! {KroonMetricMadnessHandout2013finalfeb1.pdf}
    {Metric Olympics Event Guidelines final.pdf}

    (view changes)
    8:33 am

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