What is Laws: Definition and 1000 Discussions

Law is a system of rules created and enforced through social or governmental institutions to regulate behavior, with its precise definition a matter of longstanding debate. It has been variously described as a science and the art of justice. State-enforced laws can be made by a group legislature or by a single legislator, resulting in statutes; by the executive through decrees and regulations; or established by judges through precedent, usually in common law jurisdictions. Private individuals may create legally binding contracts, including arbitration agreements that adopt alternative ways of resolving disputes to standard court litigation. The creation of laws themselves may be influenced by a constitution, written or tacit, and the rights encoded therein. The law shapes politics, economics, history and society in various ways and serves as a mediator of relations between people.
Legal systems vary between countries, with their differences analysed in comparative law. In civil law jurisdictions, a legislature or other central body codifies and consolidates the law. In common law systems, judges make binding case law through precedent, although on occasion this may be overturned by a higher court or the legislature. Historically, religious law influenced secular matters, and is still used in some religious communities. Sharia law based on Islamic principles is used as the primary legal system in several countries, including Iran and Saudi Arabia.Law's scope can be divided into two domains. Public law concerns government and society, including constitutional law, administrative law, and criminal law. Private law deals with legal disputes between individuals and/or organisations in areas such as contracts, property, torts/delicts and commercial law. This distinction is stronger in civil law countries, particularly those with a separate system of administrative courts; by contrast, the public-private law divide is less pronounced in common law jurisdictions.Law provides a source of scholarly inquiry into legal history, philosophy, economic analysis and sociology. Law also raises important and complex issues concerning equality, fairness, and justice.

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  1. NatsuIgneelFT

    Engineering How can Kirchhoff's Laws be used to solve for current in a circuit?

    I've been trying to use KVL/KCL here but I can't get any. The only thing I accomplished is R6 has 0V, 0A (KVL with its loop). All the other ones I can't get any? Thanks
  2. S

    A Would Wheeler's oscillatory universe model create different laws?

    According to physicist John Wheeler, the universe is part of a sequence of cycles of Big Bangs and Big Crunches, called cyclic or oscillatory universe model (https://en.m.wikipedia.org/wiki/Multiverse (Mentioned in "Classification schemes") According to this author, in each cycle, the laws of...
  3. M

    Conservation laws in Newtonian and Hamiltonian (symplectic) mechanics

    In Newtonian mechanics, conservation laws of momentum and angular momentum for an isolated system follow from Newton's laws plus the assumption that all forces are central. This picture tells nothing about symmetries. In contrast, in Hamiltonian mechanics, conservation laws are tightly...
  4. S

    Could MWI create universes with fundamentally different physical laws?

    Summary: Could MWI (Many Worlds Interpretation) create universes with fundamentally different physical laws? Physicist John Wheeler proposed along with Hugh Everett and Bryce DeWitt the 'Many Worlds' Interpretation of Quantum Mechanics (although he expressed some doubts about its validity) I...
  5. Prabs3257

    Laws of motion and a projectile thrown from an accelerating elevator car

    At the moment of throwing the ball the ball will have a vertical vel of 4 and horizontal of 3 wrt to elevator so as seen from inside the elevator the ball will behave like a projectile where g(eff) = 8 and with time period 1 sec hence range will be the displacement which should be 3 m but ans...
  6. D

    I Deriving tensor transformation laws

    Hi, I'm worried I've got a grave misunderstanding. Also, throughout this post, a prime mark (') will indicate the transformed versions of my tensor, coordinates, etc. I'm going to define a tensor. $$T^\mu_\nu \partial_\mu \otimes dx^\nu$$ Now I'd like to investigate how the tensor transforms...
  7. P

    Kepler's laws and proof using angular momentum

    a) Kepler's first law states that a planet like Earth displays an elliptical orbit with the sun in focus. Using M = dL/dt, prove that a planet cannot leave its plane of orbit. Note: M here is an externally applied torque that the sun exerts on the planet. diagram of the situation described b)...
  8. J

    B Quantum Entanglement Violates the Laws of Physics

    The problem with this is that only one push's worth of energy was expended. One push's worth of input cannot produce two push's worth of output, for this would violate the law that says you can't get more movement out of something than the amount of force you exert onto it (to put is very...
  9. P

    I The laws of thermodynamics and the Universe

    How would the first and second laws of thermodynamics apply to the creation and existence of the universe? I'm not a physicist (and unfortunately, do not remember a lot that I learned in Physics class in school and college about Thermodynamics). I did some searching and I have come across an...
  10. Benjamin_harsh

    Laws of conservation of momentum?

    Problem Statement: Are this 3 topics comes under laws of conservation of momentum? Relevant Equations: Are this 3 topics comes under laws of conservation of momentum? Are this 3 topics comes under laws of conservation of momentum: energy lost due to impact, inelastic impact, purely elastic...
  11. mPlummers

    I Forbidden decays and conservation laws

    Problem Statement: Hello! I'm trying to learn how to know if a particular interaction is allowed or forbidden. I found 3 decays which i can't understand. Relevant Equations: The decays are: 1) \eta \rightarrow \pi ^{0}+\gamma 2) \phi \rightarrow \rho^{0}+\gamma 3) \eta \rightarrow \pi...
  12. G

    Does the mass of an object affect its inertia?

    I know what the answer is supposed to be, but I don't understand why. Here is my logic as to why I thought a few of these suggestions should be the right answer. "C) Mass is a measure of an object’s ability to resist motion or movement of any kind." Considering F = ma, and that mass is...
  13. D

    MHB Simplify expression with laws of indices

    Helping my daughter with her math and hit this one and not sure how to advise. All help welcome(x-2y10)3 / (x-4yz4)-5 This one throws me off because I don't know how to deal with the z, as only on the right side of the divide
  14. G

    How would you adapt the laws of physics for two dimensions of time?

    So imagine there are now two dimensions of time, instead of the one dimension which we're used to. The laws of physics which we're used to won't make anymore sense unless they're adapted for the two dimensions of time. How would you adapt them?
  15. AbdullahS

    Pressure setpoints for a set of pumps (Affininity Laws)

    Hi Guys, The problem I am facing at the moment is to calculate the appropriate setpoint for a set of pumps supplying cold water to a building so that electricity and cost savings can be achieved. Here is the situation: There are three pumps connected in parallel. They are located on the ground...
  16. gibberingmouther

    Trouble Understanding How to Apply Kirchhoff's Laws

    I'm taking a break from music for a few days because I do that sometimes, and it's like a rule for me, and I usually listen to music when doing my physics homework. I'm realizing I have a little more trouble without that boost I get. But it could also be that what I'm trying to do is hard. I...
  17. D

    Explain what laws of physics were violated in this scenario....

    Homework Statement From reliable information, once Baron Münchhausen was stuck in a swamp, he pulled himself out of it by the hair. What laws of physics did the baron break? (Find the answer analytically) Homework Equations None. The Attempt at a Solution Well, I think that he breaks the...
  18. NotSoRobot

    Newton's Laws Homework question: Double incline mass problem

    Homework Statement I have a double incline mass problem where Φ=43° and θ=20°, mass_A=1.00kg and they are connected by a massless string where the net force of each block is equal to 0. Homework Equations I believe I am to use Newton's 2nd law to find the force of the tension which I have next...
  19. G

    I Pascal's law (fluids): Derivable from fundamental laws?

    Hi. Pascal's law states that static pressure in a confined incompressible fluid without gravity is the same everywhere. Is this law derivable from more fundamental laws? Some thoughts: Is Pascal's law part of the definition of the liquid state? If the liquid operates between two hydraulic...
  20. Suppaman

    Our understanding of the laws of the genetic code?

    I just did my morning exercise while listening to a short youtube talk on genetics. I do not understand it but what struck me was it seemed to be on the level of an EE discussing OHM's law, Transistor theory, and digital logic terms. Now I know all the rules that make my PC on which I am...
  21. T

    Foundation of the laws of physics

    The “Laws of Physics” arise from and reflect the lawful regularity of the physical universe. Absent that underlying lawful regularity there would be no laws of physics.Is it true that the laws of physics are descriptive of that underlying order, but are silent on the nature of its origin, of how...
  22. K

    On Newton's first and second laws

    I'm reading Scheck's book about Mechanics and it says that Newton's first law is not redundant as it defines what an inertial system is. My problem is that we could say the same about Newton's second law. Indeed, Newton's second law is only valid, in general, for inertial systems, so it also...
  23. Hiero

    I Is there any theoretical basis for laws being 2nd order

    Hi, I’m just wondering about this: Are there any theoretical reasons why physical laws take the form of 2nd order (in time) differential equations? Or is it just observed to be that way? Are there ANY laws (even in a limited context) which are 3rd (or higher) order in time?
  24. I

    News There are no laws of physics theres only the landscape.

    In my post that I have been ranting on trying to figure out how to solve things on everyday occurrences. Which was titled "Mass of a Piston" That is to say, can you use physics on the spot to calculate a golf swing that projects a ball off a cliff that you have never seen before. You don't know...
  25. navneet9431

    Laws of motion while climbing a Rope

    I'm a little confused with the application of laws of motion on a man climbing a rope. Suppose a man of mass Mg is climbing a rope with an acceleration a. Rope is massless. Now if look through the frame of the piece of rope held by the man, there is a force Mg downward by man, ma downward...
  26. resurgance2001

    Index Laws: Comparing 0.5^x & 2^x

    Homework Statement we are asked to compare the graphs of 0.5^x with 2^x using index laws Homework Equations I am not sure how the regular index laws apply The Attempt at a Solution All I can say at the moment is the the graph of 2^x is a reflection of 0.5^x in the Y axis. I don't know...
  27. Cantor080

    Practices, Laws, or Principles of living longer

    I am starting to search data on what actions are to be made for living longer. I might have to know the working of human body, but it might take lot of time. Within the time I know the working of human body, and have custom actions for me to live longer, to eliminate me not do any of the random...
  28. DracoMalfoy

    Applying Newtons Laws: Incline, static friction, kid on sled

    Homework Statement [/B] A child sits on a sled (50kg) on a snowy hill with an incline of 5 degrees. The coefficient of static friction is 0.05. What downward force must a parent apply parallel to the normal force, to prevent the child from sliding down the hill? (Answer: 366N)Homework Equations...
  29. B

    Solve Kirchhoff's Laws Homework: Find Current I in a Circuit

    Homework Statement Use Kirchhoff's Law to find the current I in the circuit shown below. Choosing the best loop can simplify the problem. (a) Which loop in the circuit should you choose? (b) Calculate the current I Homework Equations Kirchhoff's Second Law ∑V = 0 and the junction law ∑I =...
  30. opus

    Trouble w/ Limit Laws and 0/0

    Homework Statement Evaluate: $$\lim_{θ \rightarrow 0} {\frac{1-cos θ}{sin θ}}$$ Homework EquationsThe Attempt at a Solution By using trigonometric identities, I get to: $$\lim_{θ \rightarrow 0} {\frac{sin θ}{sin θ}}⋅\lim_{θ \rightarrow 0} {\frac{sin θ}{1+cos θ}}$$ By using the Limit Laws, I...
  31. TheQuestionGuy14

    B How do we know our laws of physics are correct?

    I was just curious to know, how do we know our laws of physics are correct? How do we know the laws about time or space aren't overruled (we say time flows forward, but how do we know that it can't skip back or flow backwards), because we just haven't seen it or can't perceive it?
  32. S

    I Why are the laws of physics what they are?

    In physics, at least at my level of knowledge and understanding, a lot of the most basic facts of reality start to seem a bit arbitrary. Mostly this seems to be the case with the various universal constants such as the speed of light or plank's length or the gravitational constant. So what I...
  33. J

    Using conservation of energy vs. Newton's laws in a pulley problem

    The problem is attached in the photo. The correct answer, according to the teacher's solution, was obtained using conservation of energy. Initially I tried using Newton's law/kinematics and got the wrong answer. Why didn't this work? Can you ever use Newton's law/kinematics to solve pulley...
  34. Santilopez10

    Untangling a Confusing Circuit: Solving Kirchoff's DC Laws

    Homework Statement It’s a rather confusing circuit, I’m having problems trying to understand the way current circulates through the circuit. Homework Equations Kirchoff’s DC circuits laws only, no resistive simplification neither nodal analysis The Attempt at a Solution I’ll attach my intent...
  35. Phylosopher

    Conservation laws from Lagrange's equation

    My question is related to the book: Classical Mechanics by Taylor. Section 7.8 So, In the book Taylor is trying to derive the conservation of momentum and energy from Lagrange's equation. I understood everything, but I am struggling with the concept and the following equation...
  36. Lukejohn

    How to state the laws of refraction and apply them to....

    How do i apply the laws of refraction to plane and curved surfaces. I have absolutely no idea how to even start on this one, its got nothing to do with the course, i am going to study. i need to understand this to move on but i genuinely have absolutely no interest in optics. I really can not...
  37. kolleamm

    B Do multiverses follow the same laws of physics?

    Recently I was watching Lawrence Krauss on YouTube talking about the universe originating from empty space, which seemed to make sense when he described that nothing isn't really nothing. Then he later in the video he asked the question of whether multiverses would also follow the same laws of...
  38. S

    Laws of thermodynamics basically establish its properties?

    Do the laws of thermodynamics basically establish its properties? I got to thinking, and it seems that the main purpose of the laws of thermodynamics is to establish that the thermodynamic properties. 0th & 3rd - establish Termperature as a valid property via ability to have equality & scale...
  39. bhobba

    What Is The Meaning Of Newton's Laws

    Here are Newtons Laws 1. A particle at rest stays at rest or continues to move in a straight line at constant velocity unless acted on by a force. 2, Force is mass x acceleratoion 3 To every action there is an equal or opposite reaction. What are they saying? Well 1 follows from 2 which...
  40. M. M. Fahad Joy

    How does halving the time affect the distance traveled by a falling object?

    Homework Statement If a falling object overcome 72 metres in 6 second, how much distance it overcame in first 3 second. Homework Equations s = ut+(at^2)/2 The Attempt at a Solution Here, s = 72 m u = 0 t = 6s a = ? We know, s = ut+(at^2)/2 Or, 72 = 0*6 + (a*6^2)/2 Or, 72 = 36a/2 Or, 72 = 18a...
  41. S

    Newton's laws of motion: A gun firing bullets....

    Homework Statement A gun fires bullets each of mass 1g with velocity of 10m/s by exerting a constant force of 5 g weight. Find the number of bullets fired per second (take g=10 m/s2). Homework Equations F=ma M1U1 + M2U2 = M1V1 + M2V2 (conservation of linear momentum) The Attempt at a...
  42. Lukeblackhill

    Symmetries and Conservation Laws

    I've been caught by a quite interesting statement of Berkeley physics Course Vol.1 (Chap. 5), that says "In the physical world there exist a number of conservation laws, some exact and some approximate. A conservation law is usually the consequence of some underlying symmetry in the universe."...
  43. physea

    B Laws in Otto, Diesel, etc. cycles

    Hello guys, I am a bit confused. Is it that PV/T=constant for ALL the processes of ALL cycles, like Otto, Diesel, Rankine? I know that PV=mRT, so does that mean that PV/T=constant all the time? Secondly, I am a bit confused as I read that PV^γ=constant. What is that exactly? Where does it come...
  44. bornofflame

    Rank forces according to magnitude: Newton's 2nd/3rd laws

    Homework Statement Two crates, A and B, are in an elevator as shown. The mass of crate A is greater than the mass of crate B. a. The elevator moves downward at constant speed. ... iii. Rank the forces on the crate according to magnitude, from largest to smallest. Explain your reasoning...
  45. PrathameshR

    Conceptual questions about Newton's Laws....

    Homework Statement I can't find answers to following questions in the book Concepts of Physics by H. C. Verma.1. The apparent weight of an object increases in an elevator accelerating upward. A peanut seller sells his peanuts using a beam balance in an elevator. Will he gain more if elevator...
  46. F

    Newton’s Laws and Point Particles

    Why are Newton’s laws often discussed as applying to point masses when Newton makes no references to point masses in the Principa. He seems to mention nothing other than bodies while describing each of his three laws, which are not necessarily point masses.
  47. CAT 2

    Applications of Newton's laws (friction related)

    Homework Statement A child pushes a block of wood with a mass of 0.72 kg across a smooth table. The block starts from a position of rest and after 2 seconds its has a velocity of 1.6 m/s [forward] The coefficient of friction is 0.64. a) Find the net force acting on the block of wood. b) Find...
  48. M

    Newton’s Laws and Euler’s laws

    I was looking at the Wikipedia page for Newton’s laws and read that they applied only to point particles. If we want to use F = ma on a larger object, if I read correctly, we must instead use Euler’s laws. I have a few questions about this. If this is correct why are we taught to use...
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