Podcasts
Everyday Science is offering several video podcasts. Make sure you have iTunes, then go to the Everyday Science Podcast site here and click subscribe.
A few of the podcasts are available for download below:
Air Balls (12 MB)
What makes wiffle balls curve and sail while baseballs fly fast and straight? The mass or weight of the ball affects the flying object’s INERTIA. A more weighted ball or balloon overcomes resistance from the air while less weighted objects are more easily pushed around by the air they’re traveling through. Giving a ball a bit of spin creates ift which helps the object travel father. Dimples on a spinning gold ball help it overcome air resistance by creating extra lift.
Energy Out – Energy In (3.8 MB)
Crank them up and watch them go! If we crank up (put energy IN) to the wheels of these toy cars, the wheels spin (another kind of energy) and the cars travel a certain distance. More energy in, more distance traveled. The same is true for light energy. By shining a light on a SOLAR CELL, we put light energy into a battery which STORES energy until we need it. Flip the switch and the battery releases energy making the cars go…
Infrared Roundup (27.7 MB)
Brian's infrared guns are really thermometers - they measure the heat or INFRARED energy that an object gives off. Our bodies are pretty warm, after all, body temperature is 98.6 degrees Fahrenheit or 37 degrees Celsius. What about other objects around us? When we point the infrared guns at the early morning sky, wow, that's cold yet the Earth is a lot warmer. That's because the Earth absorbs the sun's heat or infrared energy during he day and releases it back at night. The sky is many miles higher than the earth and is not nearly as affected by these daily changes.
Seeing Red (3.7 MB)
Cameras and our eyes normally see the world as it appears in visible light. But our world is also made up of a kind of 'light' that we can't see, yet it is still there. One of those is INFRARED energy or energy that is beyond the red part of the visible rainbow. Special cameras "see" infrared even when our eyes can't. Why do the red cards disappear? An infrared camera doesn't see red because the red card reflects the infrared light. What about the black box? Unlike visible light, infrared penetrates the box. The result? With infrared "camera eyes" the box almost disappears. Cool!
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