Tuesday, February 2, 2010

Flutter Effect - Dynamic Aeroelasticity

Flutter Effect is a self-feeding mechanism in which aerodynamic forces on a object (This case an airplane wing) are coupled with the natural mode of vibration of this object to produce a periodic and, sometimes, destructive motion.

Thursday, January 28, 2010

Lets pump...pumpkins

This video shows a pumpkins cannon. It uses compressed air to accelerates the pumpkins through out a long pipe. As bigger the pipe, more time the pumpkin is accelerated, so higher is the inicial velocity. At a 45 degress angle the pumpkin reach the maximum horizontal distance.

Wednesday, January 27, 2010

Drop a egg from 2 meter high without break it

This video shows how to do it and how it is possible

Nitrocellulose - the gun cotton

Nitrocellulose, an explosive similar to nitroglicerin but, instead of glicerin, it has cellulosis on its composition. It is not sensitive to impact just to heat.
It burns so fast that there is no time to exchange heat with the hand

Pascal Principle bracks the bottle

This tick uses the pascal principle to break up the bottom of a bottle! You'll need some practice to do that. Warning, the broken glass can be very dangerous!

Make ferrofluid using household materials

This video shows how to make ferrofluid using household materials

Tuesday, January 26, 2010

How to Play tennis using soap bubbles and a carpet racket

This video shows how to play tennis using a soap bubbles and a carpet racket. The soap bubbles are formed by a doubled layer of soap at extremities and a layer of water at center.
The polar part of soap molecules are bonded to the water and the nonpolar part are on the outer side.
Carpet is composed of polyester, as the bubble's outer side, so the interaction between them is very weak and the bubble do not pop out.