Were Newton's laws superseded by quantum mechanics?

No it doesn’t but in a miscroscopic word it does

when the energy is little or the masses are small

Quantum mechanics never set newtons law incorrect

Good question, the answer is no, they weren't superseded, because the two describe different regimes.

Newton's Laws pertain to something called 'classical physics', which works with the macroscopic (large scale) going-ons of the macroscopic world. Classical physics is 'deterministic' (a.k.a, you can measure things and get concrete answers, like knowing both the position and speed of a car on the motorway, for instance.)

However, when applied to calculations concerning the quantum world - the scale of atoms and below - Newton's laws fail to correctly predict things.

Quantum mechanics (QM) is the study of quantum objects and is a theory that explains things on that scale with exquisite precision. However, because of the speeds at which some quantum objects are travelling, QM says one cannot know, with infinite precision, both the position and speed of an object. This statistical nature is what differentiates it from the absolute deterministic nature of our familiar classical world.

To surmise:

classical mechanics says: 'the car's travelling this fast and here it is.'

quantum mechanics says: 'this electron is more likely here than there, and it's more likely travelling faster than slower.'

For the moment, Classical Physics and Quantum Physics stand apart, divorced, because no one yet knows how to blend the two into one theory. This is one of physics frontier questions, (and if you solve it, you'll be rich!) so for the moment, we just use the two separately.

Quantum mechanics do violate newtons laws, spesiffically his first law. However, quantum mechanics hasn't nessacarily 'superseded' newtons laws as quantum mechanics essentially describes different scales than what newtons laws describe. Newtons laws describe earthy mechanics (things that we may see and experience) quantum mechanics on the other hand deals with the extremely small, mostly they do not adress the same problems. Something that could be said to have superseded Newtons laws is relativity, (get in contact with me for a conversation about that).

Newton's laws are a good model for day-to-day purposes. There are circumstances they do not fully describe - those involving very high speeds, strong gravitational fields, or very small scales. The first two need General Relativity, the third Quantum Mechanics. If a situation involves all three then all bets are off! Quantum Mechanics, however, provides more accurate modelling of a whole range of physical phenomena, particularly to do with electromagnetism, not just mechanical ones.

It's worth noting that Newtonian Mechanics was enough to get astronauts to the Moon and back.

No. Newton's laws are used to explain our daily life while at the atomic level, they fail to explain the motion and nature of atoms and that is where quantum mechanics come in. Therefore, Newton's laws are still in use.

No. Newton's laws are derterministic for objects in space-time that operate in everyday life. However, Quantum Mechanics describes the unseen world. It seems absurd that QM in principle, superseeds Newton's laws but, if one digs deeper, QM does make use of Newton's Laws or Newtonion Mechanics when they are 'Generalized'. Some examples are Hamiltonion, Lagrangian, and Routhinian Mechanics. Hope this answers your question.

Hi. There is no conflict between Newton´s laws and quantum mechanics.

No quantum mechanics and classical mechanics go hand in hand.

Newton's laws are still used today because they more or less work fine. We used Newton's laws to go to the moon. However when travelling at any appreciable speed and when accuracy is paramount (think GPS satellites) Special Relativity is used to make more accurate calculations.

quantum mechanics is the study of the very small and the very fast (relativistic speeds). newtons laws dictate the mechanics we expect from respectively large bodies (i.e. a 'body' of particles) moving at relativitly low speeds (non-relativistic speeds).

basically,

physics research can be split into 4 groups: small and fast (quantum mechanics); small and slow (atomic/nuclear physics); big and fast (general relativity); and big and slow (newtonic physics)

At a subatomic level(smaller than the size of an atom) - yes, Newton's laws were replaced. However, for everyday situations Newton's laws are not only valid but extremely important.

Yes,

We now know that Newton's "Laws" of Motion cannot be used in the realm of very large speeds (approaching the speed of light), nor at the microscopic level. In these cases, they have been superseded by Einstein's theory of Relativity and Quantum Mechanics, respectively.

Newton's laws were formulated 355 years ago by the mathematician, physicist and astronomer Isaac Newton, and describe very accurately how bodies behave when experiencing forces. These laws have for centuries been very effective in describing the motion of projectiles, vehicles and even planets, in fact these laws describe most situations we encounter under everyday conditions, and are used all the time by many professionals, from engineers and architects to the astrophysicists who launch satellites and space probes to explore the solar system.

As useful and as accurate and Newton's laws are for most of what we experience, they do not apply at the very small and very large scale: for objects that are very large or move at speeds close to the speed of light the rules of Einstein's relativity apply, and at the very small scale, when we are looking at atoms, electrons and even more exotic particles like quarks and bosons, the rules of quantum mechanics take over.

Both relativity and quantum mechanics are very different to Newton's laws and only have a noticeable effect at the very largest and smallest scales imaginable. In particular, quantum mechanics only applies at the very smallest of scales and presently does not describe things we experience every day, for example the effect of gravity.

So, to answer your question, Newton's laws are complemented by quantum mechanics (and relativity) and just like any other scientific discipline you will use the most appropriate scientific framework for the conditions you are investigating.

For most purposes both Newton's laws and quantum mechanics are valid explanations for how systems behave, however it's best to think of the quantum scale world and the sort of scale we recognise and see on larger scales as different things. Newton's laws were discovered way before the advent of quantum mechanics, this does not mean that they were superceded though, they just solve decrepancies in the quantum world that newton's laws might not not predict. The major thing that separates the laws of motions and quantum mechanics is that newton's laws are deterministic, this means that when the same conditions are given, the same output will be given. Quantum mechanics is probablistic, if you observe a particle in could be in a different place each time you observe it. Either way they're both correct but when applied to different frames of reference