## Movement

Published November 05, 2017

Movement began to be studied in Ancient Greece around the 5th century BC. Dynamics, a science that studies the motion of real (massive) bodies under the action of forces, is already considered in the writings of Aristotle, the great scholar of antiquity (384-322 BC)...

## Inertia

Published November 05, 2017

Inertia in Latin means "peace", "inaction". Inertia, or inertia, is the desire of the body to keep its state unchanged with respect to the inertial (in the first approximation fixed) frame of reference. That is, if no external forces act on the body (applied from other bodies and the environment in general) or if these forces...

## Rotation by inertia

Published November 05, 2017

Indeed, untwisted carousel, - and turn yourself by inertia. But rotation by inertia Is it? And what's the difference between inertia of rectilinear and rotational motion? We will carry out the following experiment. We will try to rotate a rod around the vertical axis with masses (weights) loaded on it, for example, with metal balls. While these balls are near the center, spinning the rod is easy, inertia is small...

## Weightlessness

Published November 05, 2017

It is interesting, whether there is weightlessness in objects in the fall, i.e., while they are flying down, of course, without taking into account air resistance. Weighing gives a zero result - nothing weighs, neither light nor heavy. And if there is no weight - hence, weightlessness? Is it so easy to get weightless even on Earth?..

## Pendulum

Published November 05, 2017

When one talks about fluctuations, one usually remembers a pendulum. Why does he hesitate? And what are its fluctuations remarkable? If the load on the suspension is considered a small heavy point (such a pendulum is called mathematical), then the period T of oscillations is directly proportional to the square root of the length of the pendulum...

## Infrasound

Published November 05, 2017

What happens when the frequency sound is less than 16 Hz? Such fluctuations are infrasound. Perfectly spreading in the water, infrasound helps whales and other marine animals navigate in the water column. Hundreds of kilometers - for infrasound is not a hindrance. The infrasound affects the person in a peculiar way. Somehow in the theater for the play about the times of the Middle Ages ordered the famous physicist R. Wood (1868-1955) a huge organ pipe, it seems, in 40 m long...

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