The cannonball is like a float in mercury.

It does not sink only due to the fact that the density of iron is less than that of mercury.

The self-balancing cube

The secret lies in a set of flywheels under the three surfaces of the cube. Each one has an individual speed control, so by varying the rotation speed of each one, the cube can be balanced.

An exciting way to visualize music. The dance of a ferromagnetic liquid with a sound frequency.

Can one nail hold up to 12?

With knowledge of physics, you can do anything. A clear example of how to balance this design.

Synthetic diamonds

They possess a strength of 1.3-2 times greater than the resistance of natural diamonds, the breaking point of which in compression is on average 1961 MPa.

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Here's what happens to salt when it vibrates at high frequencies.

A table with a kinetic mechanism.

A little brain-breaking🤯

It's called an Ellipsograph (or Trammel of Archimedes), and if to look closely, you can notice that each ball is moving in a straight line.

A clear example of the action of centrifugal force.

Tabletop toy — the horizon of a rectangular wave.

PowerBank under pressure 🔥

The PowerBank consists of a battery installed inside, which explodes due to excessive pressure.

The "3 Tesla" magnetic resonance imaging machine has a magnet so strong that the floor below the DVD player literally sticks to the ceiling.

Stirling engine

A thermal machine in which the working body, in the form of gas or liquid, moves in a closed volume, a type of external combustion engine.

Schlieren method

It has become especially widespread for visualizing various processes in an air environment.

It is probably the only way to observe convection live. In general, this method allows to see any change of density in transparent media. For example, when a candle burns, it heats the air, reducing its density, which allows to notice the obtained heterogeneities.

Refraction is the change in the direction of a beam occurring at the boundary of the two media through which it passes

According to the principle of its operation, the pinion is an endless lever, in which the role of the second, leading, pinion was played by man, animal, water, etc.

Self-balancing table technology

The self-balancing process resumes whenever the imbalance changes while the mechanism is running. If the imbalance varies continuously, it is compensated by leaps and bounds, the frequency of which is determined by the sensitivity of the device.

Awesome kinetic Pisces Lamp

It is based on a string that is driven by small motors, and the standing waves can have several knots that can be changed by touching the string while it is in motion.

This is the result of the self-induction phenomenon

According to Faraday's experience, when a magnet is inserted into a coil, there is an induction current in the coil. This current creates a magnetic field that will be directed against the external magnetic field (according to the lens rule). This means that the Magnet will resist while it is out.

In the current phenomenon, also note that the force acting on the magnet by the field generated by the induction current is called F it is always directed upwards. Since F has a drag force, the magnet will fall slower than normal as it passes through the coil.

Levitating clocks

A spherical magnet hangs 1 cm from the clock and rotates in a circle and is the second hand.

This happens due to the electromagnetic coils and Hall sensors installed inside.