Friday, August 13, 2010
When two materials are rubbed a kind of effect appears, they become charged. The polarity (what material will become positive and what will become negative) is given by the triboelectric series.
Usually, physics teachers use a pipe and a cat or rabbit hide to demonstrate this effect. This video shows how a children playing on a plastic slide can generate static electricity.
Both, children and slide become charged and that can be noted because the children’s hairs stand on end.
Triboelectricity - Children playing on a Plastic slide
Usually, physics teachers use a pipe and a cat or rabbit hide to demonstrate this effect. This video shows how a children playing on a plastic slide can generate static electricity.
Both, children and slide become charged and that can be noted because the children’s hairs stand on end.
Friday, March 12, 2010
This video shows simple science tricks that can be used to amuse friends in a party, play with children or even in a science fair.
I wish you enjoy it.
The best science tricks for parties, at least a geek party!
Thursday, February 18, 2010
Square bubbles sounds impossible, ours brains connect the word bubble with the spherical shape. However this video shows how to produce square bubbles using a science trick.
Steve Spangler teaches how to make square bubbles
Tuesday, February 2, 2010
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.
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
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.
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
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
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
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