Wednesday, 9 December 2020

Can you balance a Pencil Forever? (Quantum) Science Loop


Can you balance a Pencil forever? In the aspect of Classical mechanics, it might be possible. However, in quantum mechanics, the answer might be different. Balancing an object on its tip is fun, but have you ever asked - How much it can balance on the tip? The video has the answers by Science Loop on Youtube.

The Inverted Pendulum System is a popular demonstration of using feedback control to
stabilize an open-loop unstable system. That definition sounds complicated. An inverted pendulum is actually a pendulum that has its center of mass above its pivot point. It is unstable and without additional help will fall over.

An inverted pendulum certainly has its center of mass above its pivot point. It is unstable and without additional help will fall over. It can be suspended stably in this inverted position by using a control system to monitor the angle of the pole and move the pivot point horizontally back under the center of mass when it starts to fall over, keeping it balanced.

A simple demonstration of moving the pivot point in a feedback system is really achieved by balancing an upturned broomstick on the end of one's finger.

A second type of inverted pendulum is a tiltmeter for tall structures, which consists of a wire anchored to the bottom of the foundation and attached to a float in a pool of oil at the top of the structure that has devices for measuring movement of the neutral position of the float away from its original position.

A tiltmeter is a useful sensitive inclinometer designed to measure very small changes from the vertical level, either on the ground or in structures.

Tiltmeters are sure used extensively for monitoring volcanoes, the response of dams to filling, the small movements of potential landslides, the orientation and volume of hydraulic fractures, and the response of structures to various influences such as loading and foundation settlement. Tiltmeters may be purely mechanical or incorporate vibrating-wire or electrolytic sensors for electronic measurement. A sensitive instrument can detect changes of certainly as little as one arc second.

Tiltmeters have a long history. The history of the seismometer is also interesting. The very first tiltmeter was a long-length stationary pendulum. These were really used in the very first large concrete dams, and are still in use today, augmented with newer technology such as laser reflectors. Although they had been used for other applications such as volcano monitoring, they have distinct disadvantages, such as their huge length and sensitivity to air currents. Even in dams, they are slowly being replaced by the modern electronic tiltmeter.

Pendulums are used in construction. Actually, pendulums are frequently used in construction, recreation, music, ceremony, science and art. Although, strictly speaking, the pendulum's function is to regulate movement and provide measurement, anything that hangs from a focal point and swings in an arc provides a picture of the pendulum influence.

Quantum mechanics and just mechanics are interesting. Popular Mechanics is a magazine of popular science and technology, featuring automotive, home, outdoor, electronics, science, do-it-yourself, and technology topics. Military topics, aviation and transportation of all types, space, tools and gadgets are also commonly featured. You might also want to research fluid mechanics, orbital mechanics, statistical mechanics, body mechanics, classical mechanics, engineering mechanics dynamics, lagrangian mechanics and continuum mechanics.

Mastering physics is interesting in and outside the physics classroom. Quantum physics is one of the interesting areas. 

You might want to try physics games, physics equations, impulse physics, a physics reference table, physics news, theoretical physics, a physics formula sheet, laws of physics, particle physics, slader physics, physics formulas, entry level jobs for physics majors, nuclear physics, crash course physics, applied physics letters, johns hopkins applied physics lab, physics for scientists and engineers, entry level jobs for physics bachelors, distance formula physics and medical physics.

Here are some other interesting pendulums:

The Foucault pendulum or Foucault's pendulum is a simple device named after French physicist Léon Foucault and conceived as an experiment to demonstrate the Earth's rotation. The pendulum was introduced in 1851 and was the first experiment to give simple, direct evidence of the Earth's rotation.

"The Pit and the Pendulum" is a short story written by Edgar Allan Poe.

A "pendulum clock" is a clock that uses a pendulum, a swinging weight, as its timekeeping element. The advantage of a pendulum for timekeeping is that it is a harmonic oscillator: It swings back and forth in a precise time interval dependent on its length, and resists swinging at various other rates.

The "Pendulum of Doom" Item exists in the World of Warcraft Game. This blue two-handed axe has an item level of 44. It is looted from Stonevault Brawler. It is in the Two-Handed Axes category. Added in Classic World of Warcraft.

The "period of a pendulum" does not depend on the mass of the ball, but only on the length of the string. Two pendula with different masses but the same length will have the same period. Two pendula with different lengths will different periods; the pendulum with the longer string will certainly have the longer period.

What is a "double pendulum"? In physics and mathematics, in the area of dynamical systems, a double pendulum is a pendulum with another pendulum attached to its end, and is a simple physical system that exhibits rich dynamic behavior with a strong sensitivity to initial conditions.

What is a "ballistic pendulum"? A ballistic pendulum is a device for measuring the velocity of a projectile, such as a bullet. A large wooden block suspended by two cords serves as the pendulum bob. When a bullet is fired into the bob, its momentum is transferred to the bob. The velocity of the bullet, in turn, can be derived from its calculated momentum.

What is a "conical pendulum"? A conical pendulum consists of a weight fixed on the end of a string or rod suspended from a pivot. Its construction is similar to an ordinary pendulum; however, instead of swinging back and forth, the bob of a conical pendulum moves at a constant speed in a circle with the string tracing out a cone.

What is a "Dowsing Pendulum"? A dowsing pendulum is typically a rock or crystal that hangs on the end of a string or chain. The pendulum is used as a way of gaining spiritual and material insight. Traditionally, dowsing pendulums were used to locate hidden water, minerals, and other such hidden objects beneath the ground.

What is a "pendulum wave"? The Pendulum Wave is a device that provides such an opportunity. It consists of a series of pendulum with increasing periods that when simultaneously released, produce the effect of a changing transverse wave that cycles back to the beginning conditions.

You might also want to read: Biomechanics of quadrupedal walking: How do four-legged animals achieve inverted pendulum-like movements?

What is a "inverted pendulum"? An inverted pendulum is a pendulum that has its center of mass above its pivot point. It is unstable and without additional help will certainly fall over.

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