Kara Sears
Newton's third law of motion states that for every action, there is an equal and opposite reaction. This law is fundamental to our understanding of physics and has real-world applications in the development of automobiles, airplanes, rockets, and boats. However, recent studies have shown that this law can be broken under certain conditions, particularly in non-equilibrium or nonequilibrium situations. Researchers have experimentally demonstrated systems with nonreciprocal interactions, where the environment becomes involved in the interaction between two particles, causing them to violate Newton's third law. Additionally, scientists have explored the concept of negative mass and its potential to break Newton's third law, leading to possible advancements in electronics, communications, and even spacecraft propulsion. These discoveries open up new avenues for exploration and a deeper understanding of the physical world.
| Characteristics | Values |
|---|---|
| Newton's Third Law | For every action, there is an equal and opposite reaction |
| Can it be broken? | Yes, in certain nonequilibrium (out-of-balance) situations |
| Examples of violation | Environment influencing the interaction between two particles |
| Nonreciprocal systems, where the law falls apart, involve exceptional points that help researchers understand phase transitions | |
| Manipulation of light to have a negative effective mass | |
| Implications of breaking the law | Understanding and developing technologies like automobiles, airplanes, rockets, and boats |
| Advancements in computing, communications, and electronics | |
| Understanding of physics and quantum physics |
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What You'll Learn
Light can break Newton's third law by 'cheating'
Newton's third law of motion states that for every action, there is an equal and opposite reaction. This idea can be observed in many everyday situations, such as walking, where a person's foot pushes against the ground, and the ground pushes back with an equal and opposite force. However, German scientists recently discovered a way to seemingly break this law by manipulating the mass of photons, which are believed to have no mass. This manipulation involves the use of "effective mass", where light pulses can exhibit negative effective mass depending on the shape of the light waves and the structure of the crystal they pass through.
Ulf Peschel of the University of Erlangen-Nuremberg in Germany and his colleagues created a series of laser pulses in two loops of fibre-optic cable. The pulses were split between the loops, with one loop being slightly longer than the other. As a result, the light in the longer loop experienced a relative delay, and when the pulses reconverged at the contact point, they shared photons. This interference pattern gave the pulses an effective mass, allowing them to interact with each other and accelerate in the same direction, contrary to Newton's third law.
The phenomenon observed in this experiment is similar to what happens with a stroboscope or a spoked wheel turning under a strobe, where the wheel can appear to move at a different speed or even backwards due to the interference between the light pulses. By exploiting this trick with light, scientists have essentially cheated Newton's third law, as the law assumes that objects have mass. However, this cheat may have practical applications, such as improving spacecraft propulsion and leading to faster electronics and more reliable communications.
While this discovery may have potential benefits, it is important to recognize that it does not disprove Newton's third law but rather demonstrates the complexity of physics and the innovative ways in which scientists can manipulate known principles to achieve new outcomes.
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Laser pulses can accelerate without push-back
Newton's third law states that for every action, there is an equal and opposite reaction. This law can be violated in certain nonequilibrium situations, and one such example is through the use of laser pulses.
Laser pulses can be manipulated to accelerate without push-back, seemingly breaking Newton's third law. This phenomenon is achieved by exploiting a unique property of light. By directing laser pulses into certain materials, such as crystals, the light can be made to behave as if it has mass, known as "effective mass." The shape of the light waves and the structure of the crystal play a crucial role in determining whether the effective mass is negative or positive.
Ulf Peschel of the University of Erlangen-Nuremberg in Germany demonstrated this concept by creating a series of laser pulses in two loops of fibre-optic cable. One loop was slightly longer than the other, causing a delay in the light travelling through it. When the pulses from the two loops reconverge, they interact, with the longer loop sharing some of its photons with the shorter one. This interaction results in the pulses effectively accelerating each other in the same direction, violating Newton's third law.
The implications of this discovery are significant. By harnessing this effect, researchers may be able to develop faster electronics and more reliable communications. Additionally, it could lead to advancements in computer processing power and the creation of bright displays like laser screens. Furthermore, laser acceleration has the advantage of being compact and capable of producing high-power beams, making it useful for a range of applications, including treating deep-seated tumours with heavy ions.
While the concept of laser pulses breaking Newton's third law may seem like cheating, it showcases the fascinating ways in which the fundamental laws of physics can be manipulated under specific conditions.
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Nonreciprocal interactions in non-equilibrium systems
Newton's third law, which states that for every action, there is an equal and opposite reaction, can be violated in certain non-equilibrium situations. These violations result in nonreciprocal interactions, where the forces between two objects or particles do not balance out. This can occur when the environment influences the interaction between the particles.
Nonreciprocal interactions are also prevalent in living systems, such as predator-prey dynamics, where the prey is repelled by the predator but the predator is attracted to the prey. These interactions can be used to describe phenomena such as travelling waves, flocking of birds, and swarming of fish. Additionally, non-reciprocal interactions can occur in bacterial mixtures, where quorum-sensing and chemotaxis lead to mediated interactions that are not constrained by Newton's third law.
Furthermore, nonreciprocal interactions have been explored in the context of light and laser pulses. By creating a series of laser pulses in two loops of fibre-optic cable, researchers demonstrated that light pulses can exhibit negative effective mass. This behaviour breaks Newton's third law by allowing pulses with positive and negative effective mass to interact and accelerate in the same direction.
The study of nonreciprocal interactions in non-equilibrium systems has led to a deeper understanding of the behaviour of matter and energy. Researchers continue to investigate the implications of these interactions, with potential applications in various fields, including physics, biology, and technology.
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Negative mass and its implications
Newton's third law of motion states that for every action, there is an equal and opposite reaction. However, this law can be violated in certain nonequilibrium situations, such as when the environment becomes involved in the interaction between two particles. One example of a system with nonreciprocal interactions is the behavior of light, which can appear to break Newton's third law by exploiting a trick that gives it a negative effective mass.
The concept of negative mass is a hypothetical idea in physics that has been the subject of much speculation and debate. It was first proposed by Hermann Bondi in the 1950s as a possible explanation for the expanding universe. Negative mass refers to the idea that some objects may have a mass that is opposite in sign to their normal positive mass. In other words, if an object with negative mass were pushed in one direction, it would accelerate in the opposite direction, as if repelled by the force applied to it. This is in contrast to objects with positive mass, which move in the same direction as the force applied to them.
The behavior of negative mass can be understood by considering the three conceptually distinct quantities of mass: inertial mass, active gravitational mass, and passive gravitational mass. In the case of negative mass, the assumption is that the inertial mass is negative, which would result in counter-intuitive motion. For example, an object with negative inertial mass would accelerate in the opposite direction to the force applied to it. This unusual behavior has intriguing implications for our understanding of the universe, including speculative technologies such as time travel, wormhole construction, and faster-than-light warp drives.
In 2017, physicists at Washington State University created a fluid with negative mass in the laboratory. They achieved this by cooling rubidium atoms to just above absolute zero, creating a Bose-Einstein condensate where particles behave according to quantum mechanics. This experimental setup allowed for heightened control over the nature of negative mass, providing a valuable tool for studying analogous physics in astrophysics and cosmological phenomena.
The creation of negative mass in the laboratory has opened up new avenues for exploration and experimentation. By studying the behavior of negative mass, researchers can gain insights into challenging concepts in the cosmos, such as neutron stars, black holes, and dark energy. The phenomenon of negative mass highlights the complex and fascinating nature of physics, where even fundamental laws like Newton's third law can be broken under certain conditions.
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Exceptional points and phase transitions
In nonreciprocal systems, where Newton's third law does not hold, exceptional points are helping researchers understand phase transitions and other phenomena. For example, flocking birds show how easily the law is broken: because they can't see behind them, individual birds change their flight patterns in response to the birds ahead of them. Bird A does not interact with Bird B in the same way that Bird B interacts with Bird A; it's not reciprocal.
Phase transitions in certain non-equilibrium systems cannot be described using the classical laws of statistical mechanics. A mathematical approach involving exceptional points now solves this problem. Exceptional points are not new; physicists and mathematicians have studied them for decades in a variety of settings. But they have never been associated so generally with this type of phase transition.
By programming a fleet of robots to behave nonreciprocally—blue cars react to red cars differently than red cars react to blue cars—a team of researchers elicited spontaneous phase transitions. These exceptional points also control phase transitions in nonreciprocal systems.
Phase transitions, such as water freezing, are well understood in systems at equilibrium. However, in non-equilibrium systems, the equality of action and reaction is broken, leading to non-reciprocal interactions between the constituent elements of the system. In these systems, statistical mechanics falls short in representing phase transitions.
The new work also draws connections among a range of areas and phenomena that, for years, haven't seemed to have anything in common.
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Frequently asked questions
Yes, Newton's third law can be broken. Newton's third law states that for every action, there is an equal and opposite reaction. However, this law can be violated in certain nonequilibrium situations, also known as nonreciprocal systems, where the environment becomes involved in the interaction between two particles.
Researchers have broken Newton's third law by creating a system where laser pulses accelerate themselves around loops of optical fibre, with no corresponding push-back. This creates the illusion of mass, specifically negative effective mass, which causes the pulses to accelerate in the same direction, seemingly breaking Newton's third law.
Breaking Newton's third law has potential implications for faster electronics, more reliable communications, and more powerful computers. It could also lead to advancements in starship engineering, such as better spacecraft propulsion.
Nonreciprocal systems are systems where Newton's third law does not hold, and these systems exhibit unusual behaviours. In these systems, there are exceptional points where two or more properties become indistinguishable, leading to spontaneous phase transitions. Researchers have experimentally demonstrated nonreciprocal interactions using charged microparticles levitating at different heights in a plasma chamber, creating a mixture of two liquids with different temperatures.
