Physics at Home Archive - Page 4
Light: The Physics of Art and Visual Perception - Apr 12, 2011
A diffracting grating shows the colors within light like a prism. The tiny slits that make up the grating bend entering light into different directions according to their wavelength, which shows the different colors.
Balloon Analogy in Cosmology - Feb 1, 2011
Quasars are the most distant objects we can see from Earth. Their light reaches us from billions of years in the past. Astronomers know how far they really are from us because the light we see is dramatically redshifted, meaning they are moving away from us astonishingly fast. See the Balloon Analogy in Cosmology to learn more about the expansion of the universe and how astronomers use redshift to measure distances in space. Find out how you can paste galaxies on a balloon and make a model of how the universe expands.
Doppler Physlet - Dec 1, 2010
Laser Applications - Nov 1, 2010
Near-Earth Object Program - Oct 16, 2010
Asteroids are usually shown between the orbits of Mars and Jupiter, but they also swing in as far as Earth's orbit, and frequently. At the time of this writing, astronomers have identified 1156 potentially hazardous asteroids, so-called because of their large size and close projected approach to Earth.
Beyond the search for renewable energy sources, a complementary approach is to save energy by using it more efficiently. See this California state government website to find out how changes to your home and your lifestyle can help. To learn more, visit U.S. Department of Energy: Energy Efficiency & Renewable Energy.
The Physics Classroom: Refraction of Light - Sep 16, 2010
Use this simulation to explore how light waves bend when they go from one medium into another, like from air into water.
Konigsberg Bridge - Sep 1, 2010
If you enjoy solving puzzles, try the seven bridges challenge.
Splash (fluid mechanics) - Aug 16, 2010
Investigate splashes by dropping different-sized objects into containers of water. Also, you can squeeze drops out of a medicine dropper to make splashes on hard surfaces or on water or milk. (Be sure to do this activity with an adult.) To find out what happens if you drop a half-brick into water, see the photograph at the bottom of Splash (fluid mechanics).
Water on the Move - Aug 1, 2010
Using the instructions on Water on the Move, you can create a model with everyday materials that shows how the water moves as a wave passes by. To visualize the movement of all the water in a wave, see the third animation on this Kettering University page.