ON A COLLISION COURSE

When a running ball hit a ball at rest, the latter starts moving and the moving ball comes to rest (when they have same mass ). Here the energy is transferred from the first ball to the second due to impact. The collision plays an important role in physics.

When a ball hits a wall, the energy cannot be transferred to the wall because of its heaviness. Hence the ball bounce back with the same speed and the energy.

The proton and neutron is having the same mass. This concept is discovered using collision as in the ball example.

The 'light' particle photon collides on metal like zinc.Cconsequently an electron is ejected out. This is the photoelectric effect widely used in electronics.

If the air molecules collides on the walls of the container(tubes and balloons) like balls on the wall, it gives raise to pressure. More air, more collisions, more pressure.

When a meteor hits a planet, the energy gets dissipated and creates a crater. The moon has so many craters.

If a neutron impinges on a atom like uranium and thorium, it splits up the atom and lot of energy is released. It is the principle of atom bomb and nuclear reactor.

World largest single machine is situated near Geneva. It is called 'Large hadron collider'. It is a circular tunnel of 27 kilometers long and burried deep in the earth at 175 meters. It is manned by more than 1000 scientists and engineers from 100 countries. In the tunnel atomic particles are accelerated by powerful super magnets. Two beams of atomic particles travel in opposite directions in the ring and collide. When the particles make the impact , scientists study, infer and make conclusions and discoveries.

The particle 'Higgs Bosson' (God's particle which is responsible for the mass) is discovered in this machine. People hopes to answer many questions about physical universe using this collider.

Road Accidents are collisions that should be prevented at all costs.

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THE EARTH, A SUPER ORGANISM

JOIN MY COURSE: "Become a programmer in a day with python" A man called 'love lock' (what a name) proposed a theory called Gaia theory, named after Greek Goddess. It says, "Earth is a self-regulating organism like a human being. The organic life in it interacts with in-organic matter and maintains atmosphere, temperature and environment". Hence the earth is still suitable for the life to thrive. Imagine, in a particular place, there are lot of flowers. Some flowers are white and some are darkly coloured. We know, white reflects light and heat while dark absorbs the same. White flowers can thrive in hot climate. But dark flowers requires cold climate. The absorption and reflection balances and the environment reaches average, warm temperature at which both the flowers can co-exist. This is the essence of "Gaia" theory. On our earth, ...

THE PARABOLA

A jet of water shooting from a hose pipe will follow a parabolic path. What is the so special about parabola. Y= x^2 Draw a graph for the above equation. It will result in a parabola. This parabola is also called unit parabola. Any equation involving square will yield a parabola. Example: Y = 2x^2 +3x+3 (also called quadratic equation) X= 2 and -2, both satisfies the equation 4 = X^2. Parabolic equations always have two solutions. Any motion taking place freely under gravity follows parabolic path. Examples: An object dropped from a moving train, A bomb dropped from flying plane, A ball kicked upwards. If a beam of light rays fall on the parabolic shaped mirror, they will be reflected and brought to focus on a point. This fact is made use of in Dish Antenna, Telescope mirrors, etc. ...

DISORDER IS THE "ORDER OF THE DAY"

Imagine a balloon full of air. The air molecules are moving randomly inside the balloon. Let us pierce the balloon with a pin. The air rushes out. Why should not the air molecules stay inside the balloon safely and ignore the little hole? That is not the way the world works. The molecules always "want to occupy as many states as possible". Hence the air goes out in the open to occupy more volume. The things always goes into disorder (entropy) and the disorder increases with time. The above statement is what we call "second law of thermodynamics". Consider a cup of coffee on the table. Suppose the heat from entire room flows to your cup of coffee, the coffee will boil and the rest of the room will freeze. Freezing means bringing things to order and arrangement. It violates the second law. Hence it will never happen. Hence heat must flow from high ...

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