PHYSICS OF AN ACCIDENT

Stopping a car running at 60 kmph all of a sudden is equal to elephant falling from a third floor and hitting the ground. Lot of energy has to be dissipated. Engine is constructed in front portion of the car so that it can absorb the impact in case of the crash. The front of the car should not be rigid. It should absorb and dissipate the energy by crumbling and deforming. The bumper is also used to absorb energy during the crash. Besides, there are air bags in front of the passengers.

During an impact, there is a large deceleration (negative acceleration). The loose and soft organs in the body cannot withstand such a force and energy. Hence so many safety measures are built in a car.

Engine is at the front and the boot is at the back in every car to withstand the unexpected collision. Wash rooms are kept at the two ends of every compartment of a passenger train for the same reason.

The lunar module of the Apollo landed safely on the moon. The acceleration by the lunar gravity was reduced by firing small rockets. But when the Apollo reached the earth from the moon, it just crashed into the ocean. The energy of crash was dissipated into the waters. The module came above the waters by deflating the balloons.

We have developed sophisticated cars with so many safety measures. Still the accidents are on the rise. Now, Tesla company is developing self driving cars. Will it be completely eliminate human errors? Will it reduce the accidents greatly? We have to wait and see.

But, We have to do everything in our control, everything humanly possible to reduce the road accidents world wide.
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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 oxygen constitute 20% of the atmosphere. The oxygen level is always mai

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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. Inverted parabola shape is used in the construction of buildings and bridges. Because the shape is able to bear more weight. A plane

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