What is the law of free fall? Detailed answer

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What is the law of free fall? Detailed answer

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What is the law of free fall?

A falling body is an unsupported body that is attracted to the Earth's surface by the force of gravity. Gravity is the force with which the Earth attracts other objects towards itself. In the absence of air resistance, bodies fall in accordance with the law known as the law of free fall, first formulated by the famous Italian scientist Galileo in the sixteenth century.

Galileo conducted many experiments with falling bodies in his laboratory. Based on these experiments, he derived this law: in airless space, the speed of a falling body depends only on the height of the fall and it does not depend on its mass. The longer a body is in free fall, the faster it moves. When a body increases its speed, we say that it has received an acceleration. The acceleration of a freely falling body is 9,8 meters per second. This means that for every second that a body falls, the speed of its fall increases by about ten meters per second.

After the first second, the falling body has a speed of 9,8 meters per second. After the first two seconds, his speed becomes 9,8 plus 9,8 meters, then 19,6 meters per second and so on. Passing through a layer of air, a falling body cannot pick up speed in such a progression. It can only pick up a certain speed. In view of air resistance, there is a limit to the speed of a falling object. This is true even for the heaviest objects. They get accelerated at the beginning of the fall, but at the same time, air resistance also increases. It soon balances the force of gravity. From this moment on, the acceleration of the fall of the body ceases to increase. It reaches its "terminal speed" and does not change until the end of the fall.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

What is surge flood?

When a strong and prolonged western wind raises the water level in the narrow Gulf of Finland, the Neva turns back and floods St. Petersburg, located on a low coast. This is an example of a surge flood. The two biggest ones happened exactly 100 years apart: in 1824 (remember A. S. Pushkin's poem "The Bronze Horseman") and in 1924. The dam built in the bay saved the city of Petra forever from this disaster.

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