In fact, it is an optical illusion.

In this video, the frame rate of the camera unit coincides with the rotation frequency of the helicopter blades. That is why it appears that the blades are not rotating.

If the Moon were a giant mirror.

Rehbinder Effect visual demonstration

It represents an adsorption reduction of strength — a change in the mechanical properties of solids due to physical and chemical processes causing a decrease in the surface energy of the body.

In the case of a crystalline solid, what is also significant is that the crystal exhibits the defects in structure necessary for the nucleation of cracks, which then propagate under the influence of the medium.

The drops of water act as a collecting lens, the image for the observer is inverted.

A collecting lens is a lens which is thicker in the middle than at the edges.

The way soap acts?

Liquid molecules experience mutual attraction forces, thus causing surface tension.

By getting into the surface layer of water, soap molecules noticeably weaken the surface tension forces.
Soap and laundry detergents reduce the surface tension of water, increasing its permeability. Therefore, soapy water soaks in and cleans fabrics and other materials, taking the dirt away with it.

If we place the lens on the window sill and get an image of distant objects outside the window on the screen, the distance between the lens and the screen will be equal to the focal length.

Demonstration of a mere application of physics.

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Van de Graaff generator in action.

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AREOMETER

Concentration and density data are in constant demand. The strength of alcoholic beverages, the quality of acid in a battery, the condition of antifreeze, saline solutions, and the content of soluble substances in juice are just a few of the tasks where areometers are indispensable.

Visual illustration of the force of pressure ejection when a tire explodes.

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The vacuum was kept until the can was tilted.

The neck of the can is covered with a wire mesh. As it tilts it, the surface tension of the water prevents air from passing through the mesh until it flips over, increasing the pressure at the bottom and allowing air to displace the water at the top.

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Two-dimensional magnetic levitation.

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Ballistics

All shot at 100,000 frames per second.

Comparison of various pistol and rifle ammunition.

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Clear example of how effective LED bulbs are.

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Effect of temperature on the material

The vast majority of substances expand when heated.

This can easily be explained in terms of the mechanical theory of heat, since the molecules or atoms of a substance begin to move faster when heated.

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A flying drone with Archimedean propellers (based on sketches of Leonardo da Vinci), was created by American students at the University of Maryland.

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Niji cube

Here the iridescent spectrum is not created by refraction, as with a prism, but by diffraction, where light waves deconstructively and structurally interfere.

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The law of conservation of energy

A classic illustration of the principle is a spring or mathematical pendulum with negligibly small damping.

In the case of a spring pendulum, the potential energy of the deformed spring is converted into kinetic energy of the weight and back as it oscillates.

Likewise in the case of a mathematical pendulum, the potential energy of a weight in a field of gravity behaves in a similar way.

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This is how a chain reaction occurs when a radioactive substance explodes.

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Aerodynamics at home

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Glyphosate is a non-selective systemic herbicide used to control weeds. Among herbicides it ranks first in the world in terms of production volumes.

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