Saturday, December 31, 2016

Train Experiment using Electromagnetism

The train experiment that was demonstrated on the video uses the concept known as “Electromagnetism”. Magnets has always been around and we are all accustomed that they have 2 poles called the North and South. These poles are responsible for magnetic field around a magnet. These magnetic field is technically a push and pull force. The North Pole produces the push force and the South Pole pulls the force. Thus magnets of the opposite poles attract when attached together and they repel if attempted to face the same poles.

A copper wire or an electric conductor produces a magnetic field when electric current passes through however the force it produces goes only in one direction or a single pole (either push or pull only). The train experiment used a battery where the electric current will be coming from. For a battery to give out electric current, its positive and negative connector should have a conductor. The experiment attached two magnets on both ends of the battery. Electric current also passes through Magnets thus making it a conductor. The magnets has two purpose in the experiment, first it is used as a way point for electricity coming from the battery to go to the copper wire and from the copper wire going back to the other end point of the battery (since the magnets on both ends of the battery touches the copper wire making them all like a connected circuit), secondly, it will be used to repel itself from the magnetic field produced by the copper wire thus making the train move. When current flows through the copper, it produces a magnetic field which produces a push or pull force and the magnets are arranged such that their magnetic field opposes the magnetic field from the copper wire making them repel and move.

Thursday, December 29, 2016

Heat Engine

An abundant source of energy nowadays is heat. it can be obtained in many ways such as from the sun. however with the advancement of science there are many ways how we can convert heat into other kinds of energy. One of the ways to convert heat into energy is through a heat engine. the  heat engine is built in the most efficient and effective manner to absorb heat and produce an amount of mechanical energy. the most practical example where we can see how this is applied in real life are from old trains being fueled with charcoal. 

According to the law of thermodynamics, gas molecules vibrate, and produces kinetic energy (like the wind) when in contact with heat. The higher the heat temperature then the faster and stronger these gas molecules move. If they are contained in a space, the molecules bounce and they create an amount of pressure. The force of the pressure depends on the tightness of space in the container. If we observe the video above, gas molecules inside the glass container are heated and produces pressure. To make this pressure to work, the machine attempts to compress the space making gas molecules inside produce higher amount of pressure thus forcing the machine to be pushed back. The machine then uses this force to make the wheel spin and then repeats the cycle and eventually stops when the gas molecules returns to their stable state which happens when heat is gone.

Tuesday, December 13, 2016

Walking Water

If we drop a water droplet on a surface of water, it bounces for a few times before it merges itself to the water surface. This event is what we call "Coalescence" and it is natural for water to merge together and grow larger in volume after merging. The interesting fact here is that the water droplet had to bounce before it gets totally merged. The video above shows a drop of water in slow motion. As it travels down, there is air resistance being compressed between the water surface and the water droplet. This air resistance causes the water droplet to bounce back up and goes down again. This goes on until the water droplet's force is stronger than the air resistance.

Here is another video where we can technically levitate a water droplet using air resistance.

We notice in the experiment above that we can use sound to float water droplets in the air. As we know, sound travels through air and it brings with them an amount of force depending on the frequency. The experiment shows producing a sound with a force heavier than the water droplet which makes it to stay floating in the air.