Showing posts with label Physics. Show all posts
Showing posts with label Physics. Show all posts
Flutter Effect - Dynamic Aeroelasticity

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.
Lets pump...pumpkins

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.
Pascal Principle bracks the bottle

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!
Sodium Acittate hot ice

Sodium Acittate hot ice


This video shows how to make hot ice, a supper saturated solution of sodium acittate that crystallizes when you disturb it or add a small crystal.
Falling Smoke

Falling Smoke



The smoke inside the bottle falls becouse it is cold. Otherwise it ascend with the warm air as we always see.
Leidenfrost Effect: putting the finger inside molten lead

Leidenfrost Effect: putting the finger inside molten lead


This video show the physical principle that allows put the finger inside a molten lead without burn it.
The humidity of ours skin evaporates and the molten lead do not touch the finger.
The same happens with water drops in contact with a very hot frying pan . They don’t evaporate immediately because a vapor layer protects the drop from the heat.
Collection of experiments using a Van de Graaff generator

Collection of experiments using a Van de Graaff generator


"This is a collection of experiments using a Van de Graaff generator.

The generator uses a belt and two rollers to build up a charge in the dome on top. The electrons will jump from the dome to reach a grounded object. Since like charges repel one another, objects placed on top of the dome will become charged and then be repelled.

This is the same machine sometimes used to make someone's hair stand up in classrooms or in science centers."
From: You tube descripion video
Slow-motion Rubber Band Trick: that is Amazing!

Slow-motion Rubber Band Trick: that is Amazing!


A simple science trick you can do at home, using two rubber bands and a CRT TV screen. The TV screen works as a stroboscopic light, and when the frequency of rubber band is near the TV vertical frequency the rubber band seems to moving in slow motion.
Thermal  rubber band machine

Thermal rubber band machine


"This is a demonstration called the rubber band heat engine. As the name suggests, you take rubber bands, apply heat to them and they do work for you... just not terribly much of it. But its interesting nonetheless."
From: youtube video description