Physics trivia

# Physics trivia

The world of Physics presents numerous curiosities that can make us strange because they go beyond the limits of what we think is possible.

The word Physics comes from the term physis , which means nature, therefore, this science is dedicated to the understanding of natural phenomena, reconstructing them through experiments and describing them through mathematical equations.

The concepts and phenomena studied by Physics are always present in our daily lives. The simple act of flipping a switch and seeing a light bulb light up, for example, involves many physical concepts.

The world of Physics is full of situations that challenge our senses and generate a lot of curiosity in the face of the peculiarity of some phenomena. Several physical principles, when understood, generate a sensation of strangeness and discomfort, as they reveal the opposite of what is understood by common sense or go beyond the limit of what we think is possible.

For speeds close to that of light, time can be altered! A traveler traveling at a speed close to or equal to 3 x 108 m/s suffers the effects of time dilation.

♦ The fall time is independent of the mass

If two objects of different masses are dropped from the same height, they will reach the ground at the same time, if air resistance can be disregarded. Our senses tell us that the heaviest object should fall faster, but if we drop a bowling ball and a chicken feather at the same height, for example, they will hit the ground together!

Free fall experiment

The video above, even though it has no subtitles, makes it clear that, in an environment where the air is removed, the free fall of objects with different masses occurs in the same time interval.

♦ Avogadro’s number and world hair

The so -called Avogadro number is a fixed amount of molecules present in a gaseous sample. The value of Avogadro’s constant is 6.02 x 1023 molecules. If the entire world population had hair and if we consider that there are, on average, three million hairs per person, the number of hairs in the world would be less than Avogadro’s number.

A = Avogadro’s number = 6.02 x 10 23 molecules

M = World population ≈ 7.3 x 10 9 people

C = Hair strands ≈ 3 x 10 6 strands per person

M x F C = 7.3 x 10 9 . 3 x 10 6 = 2.19 x 10 16

Note that Avogadro’s number is much higher than the hypothetical number of hairs in the world.

Below you can check texts that bring other curiosities related to the world of Physics. Surprise yourself!