Dark matter's status as a mysterious and invisible lurker in the universe has frustrated scientists for years. Now, one hopes to solve the puzzle a different way: using a modified version of Newton's second law that would eliminate the need for dark matter altogether. Researchers in Brazil have devised an experiment that could put the modified Newtonian dynamics (MOND) to the test, New Scientist reports.
A moving sled and a static reporter make for one perfect expression of torque
By Adam Weiner
Posted 04.07.2008 at 6:26 pm 1 Comment
This video provides a beautiful illustration of Newton’s Second Law in both its linear and angular form. The discombobulated newscaster experiences a linear acceleration in a backward direction, and a clockwiseangular acceleration that gets him spinning, all as a result of the force of the sled’s impact.
How can something that appears to defy the laws of physics follow them so perfectly?
By Adam Weiner
Posted 02.25.2008 at 4:18 pm 1 Comment
The counterintuitive demonstration in the video is a beautiful example of the concept of center of gravity. It sure looks like the fork and spoon should immediately teeter off of the glass and crash onto the table. And its even more dramatic when half of the matchstick burns away but the contraption still balances on the edge of the glass. But its all physics.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.