Tonie Hansen – NVIDIA
The non-profit Charity foundation portion of NVIDIA is working on bringing visualization into the classroom using their computer components. Video games and simulations have been proven to help students learn visual concepts.
They are asking for people to be a part of the Advisory Committee to help beta-test the visualizations that would be available online. Please contact Toni Hansen if you’re interested.
Toni Hansen, Philanthropy and Social Responsibility
2701 San Tomas Expressway
Santa Clara, CA 95050
CJ Chretien – Leadership Public Schools, Richmond
Chretien showed a few examples of video clips available online in the classroom including the recent Mythbusters episode testing the “Drop vs Shot Bullet” myth. An edited version of the episode is available for download here (removed next Thursday, October 15, 2009).
David Kagan – CSU Chico
After seeing a demonstration about the movement of a soda can that is unshaken compared to a soda can that had been shaken, Kagan wrote an article to “The Physics Teacher.” After that publication, a European TV show contacted him about it in order to use the experiment on the show.
Ann & Jon Hanks – PASCO Scientific
Explained raffle prizes: four PASCO generators for standing wave demo; dynamic set for incline plane (PASTrack). They also demoed a new modular LED strobe that can be realigned for different set-ups.
Don Rathjen – Exploratorium Teacher Institute
Rathjen explained the Science Snack based on the Exploratorium “Vanna” exhibit which is an optical illusion. It is made by taking three copies of a smiling person’s image and using two to create a modified version. It is made by cutting out the eyes and smile of one, apply them upside on one to a second. Starting with the modified and unmodified images upside down, explained that the pictures are of “smiling people.” When rotated though, it is clear one (the modified one) is not smiling. Don uses this exhibit and demonstration to explain the role the brain plays in interpretation of what our eyes see. There is more information available on the Exploratorium’s website.
Bernard Cleyet – retired
Cleyet explored the dissipation of movement of a dynamic cart using several different sensors. Beginning with a cart that had spring oscillators on either side, Cleyet graphed the displacement and found that the decay was not quite exponential. When a force probe is used, the force is fairly linear, as expected with a steel spring that obeys Hooke’s Law. Cleyet repeated the experiment with rubber bands instead of springs and found a much more extreme decay of motion. The rubber band experiment matches a historetic dissipation more than an exponential. The final trial used a magnetic repulsion array for its oscillator. For more information contact: firstname.lastname@example.org
Reklis discussed uses for robotics in a normal physics classroom. His new endeavor is a constant velocity robot with a programmable speed with additional sensors. Currently, it has a sensor that senses an approaching wall and stops. He also plans to have sensors that allow the car to follow a set line on the ground and add a uniform acceleration mode.
Raizada discussed teaching Physics to children at a young age in order to inspire students to get involved and interested in Physics. She is looking for ideas on how to grow her program.
Bree Barnett Dreyfuss – Amador Valley High School
Barnett Dreyfuss discussed “blinky light” activity using small LED lights. The original idea was developed by Sebastian Martin from the Exploratorium to study motion. LED lights with three settings by Inova work well, available typically from Target in the flashlight section for ~$8. The lights are set to the second setting on “dim” which is actually oscillating 100/ second. Samples of images produced by her students are available here. Pictures can be used to show several concepts including:
– projectile motion of objects, including those with unevenly distributed mass whose center of mass will follow a parabolic shape
– centripetal motion when attached to a bike wheel or other rotationary device can show the different speeds that would occur at different radius from the center
– motion of the body by attaching lights to the body and doing simple movements like running or walking
– free fall motion of differently massed or shaped objects from the same height at the same time to experiment with air resistance or to compare horizontally launched projectiles to those dropped
Dan Gill – North Tahoe High School
Gill attempted an experiment in which he would be inside a helium filled balloon to observe the changes in sound. Several theories as to why helium affects the pitch of a person’s voice exist but he doesn’t agree with them. Planning to answer a cell phone while inside the balloon, Gill also inserted a squeaky dog toy, whistle and tuning fork. The idea came from a YouTube video of a street performer using a giant balloon. Before the experiment could be completed, the balloon burst but we are looking forward to potentially seeing it in the Spring. The video of the attempt will be available on the NCNAAPT YouTube site here.
Bill Papke – American River College
Papke wanted to share that 5mW Green lasers are available at American Science & Surplus for much less than the normal retail price. The site also carries the innards of lasers, diffraction gratings, etc. Papke also recommended the novel “Flash Forward” by Robert Sawyer which is being made into a TV series right now.
Dan Burns – Los Gatos High School
Burns shared an infrared detection card that fluoresces (change color) if exposed to infrared light and can be activated by the infrared light from a remote control. The card is made using materials that can absorb two infrared photons, jumps up an energy level and then down in steps to to release visible light. They are available for around $20, there are cheaper ones that must be activated with exposure to visible light first. Here is a link from Industrial Fiber Optics.
Carl Rosenkilde – Retired
Rosenkilde discussed the sliding bar problem that originally came from another Show & Tell a year ago by Paul Robinson. A bar was placed along the edge of a table so that ¾ of it is off the table. The bar will fall, due to its center of mass being unsupported by the table, and will spin. The length of the bar affects how much rotation will occur (with the same initial height) and Rosenkilde showed us two different lengths, one that rotates to hit the ground at 90˚ and one at 180˚. A solution was presented as to how to prove that angular momentum is conserved. Email: email@example.com
Chuck Hunt – American River College
Hunt made several announcements about the upcoming Spring meeting at the American River College in Sacramento, California during the business portion.