Laws Definition and 1000 Threads

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. 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...
  2. 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.
  3. 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...
  4. 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...
  5. Arman777

    I Exploring Dimensions in Physics: Can We Apply Laws in Different Dimensions?

    I have couple questions related to dimension and general physics law 1- Can we apply physics law in lower/higher dimensions. In another words does physics law makes sense in 2D or in 7D. 2- Is it possible that a 2D particle contains charge ? 3- Is it possible a 2D "object" exist in 3D ?
  6. thebosonbreaker

    Why were Newton's laws of motion discovered so late?

    Hi, I had a thought recently which gave rise to a rather interesting query. A helicopter works and is able to fly due to Newton's third law of motion. The propellers rotate at a high speed and exert a force on the air beneath them. By N3L, the air therefore exerts an upwards force on the...
  7. thebosonbreaker

    A question about Newton's laws & free body diagrams....

    Here I have drawn the free-body diagram for a rock (but could really be any object) which is being pulled upwards. Fa represents the applied force (let's say...by a rope) Fg represents gravity/weight of the object Ff represents friciton, i.e. the small amount of air resistance But here's my...
  8. TheQuestionGuy14

    B Are the Laws of Physics consistant and universal?

    Was just curious if there are any holes in the major laws of physics making them not consistent. Or could they change over time? And are they universal, as in, are they the same in all regions of the universe?
  9. GAURAV DADWAL

    B Michelson-Morley Exp: Laws of Reflection Explained

    Hello there, I have a problem with this image from the Michelson Morley experiment in which one tries to calculate the time taken by the light beam to traverse the arm of interferometer perpendicular to the velocity of the frame in 'ether'. So the problem is, Are laws of reflection being...
  10. E

    Newton's laws -- Blocks and pulleys problem with friction....

    Homework Statement The coefficient of friction between A and the table is μA. The coefficient of friction between A and B is μB. A, B, C and D all move with an acceleration of 2m/s^2 (A and B move to the left). Find the force that the friction between the bodies apply on B. Find the tension of...
  11. E

    Newton's laws: Block/Pulley/Wedge/Friction

    Homework Statement No friction between m2 and M. The static friction between M and the floor is μs and the dynamic is μd. When F=0, what is the minimal static friction if M doesn't move? Homework Equations F=ma Force caused by friction: μN=F The Attempt at a Solution What I thought is that...
  12. Vagulus

    Were the Laws of Physics designed for torture?

    Here is an issue to distract the scientific mind for a restful Festive Season. This is a gumnut. They fall from trees round here (Perth, Western Australia) by the tonne. They are quite small (about 9 mm in diameter) and the pointy end is sharp. You do not want to stand on the pointy end...
  13. S

    B Can energy change physical laws?

    Could huge amounts of energy change the universe's nature (fundamental physical constants, laws, dimension)? Could it change it so much that it would enable our universe to be a multiverse of level 1, 2, 3 or 4? https://en.wikipedia.org/wiki/Multiverse
  14. E

    Something I don't understand about kirchhoff's laws

    Homework Statement The value displayed on the ampetmeter is 2A. The value displayed on the voltmeter is 5V Find the unknown ε and R Homework EquationsThe Attempt at a Solution I have the correct equations, I am sure of it. However on of them is: 2*2+2*10-ε-RI1=0 How do I know if RI1 (I1 is the...
  15. F

    Motion predicted by Newton's laws

    Hello The following thought is confusing me a little. Let say we have sphererical planet with a certain mass and radius fixed in space. Now we have a point particle that at time t0 has a velocity vo that is perpendicular to the vector from the center of the plant to the particle and has a...
  16. L

    Is this a mistake on the answer key? (Newton's Laws)

    Homework Statement Homework Equations F = ma [/B]The Attempt at a Solution Why is the angle 60 degrees? Isn't it 30 degrees? [/B]
  17. Delta2

    I Invariance of the laws of physics

    The invariance of the laws of physics in space-time is a corner stone of physics and all science. A.Is this an axiom or can be derived from other more fundamental axioms? B. Are there any books that discuss how science could be if the laws of physics could be changed (for example if we could...
  18. Gilbert189

    Basic Inertia/Newton's Laws Questions

    Hello, I am taking physics (freshman, high school) and I am very confused on the current topic. We are learning about Newton's first, second and third laws. Our teacher speaks very fast and I cannot seem to understand many topics that he talks about. Questions I am confused on: 1. A plane is...
  19. I

    The Contrary Laws of Reflection

    So, I was just working out on color and reflection but then turned a little bit confused. The main phenomenon we study everywhere is that a colored object absorbs light of all wavelengths excepting the light of its own color. Then comes the problem. As per that, if I beam a GREEN LASER on a RED...
  20. G

    Engineering Simulation of Circuits Without Kirchhoff's Laws?

    1. The problem statement, all variables, and given/known data I am currently drafting a proposal for a project in Computational Physics. I'm planning on creating a program that simulates circuits numerically instead of solving the system of equations. The purpose of my project is to observe the...
  21. C

    I Is the Rewriting of Logs Valid for All Values of x?

    Perhaps this is a simple question but I can't see a way to understand it. I have some expression of the form ##\ln(1-1/(1-x))## and I perform the following manipulations using simple algebra and laws of logs: $$\ln \left(1-\frac{1}{1-x}\right) = \ln \left(\frac{1-x-1}{1-x}\right) = \ln...
  22. Q

    News What experiments did Newton conduct to determine his Laws of Motion?

    Hello Everyone ! I am interesting to find descriptions of the series of experiments that Newton made for determining the laws of motion. In English of course.
  23. M

    Newton's laws in polar coordinates

    I need explanation of these formulas for polar coordinate system where position of an object is characterized by 2 vectors: r - from the origin to the object, and Φ - perpendicular to r, in the direction of rotation. https://drive.google.com/file/d/0ByKDaNybBn_eakJmS3dUVXVZUDA/view?usp=sharing...
  24. davidge

    I My conclusions regarding "the laws of nature"

    You may know I started a thread on this forum asking questions about the statement in General Relativity that "the laws of nature are the same in inertial frames". Guessing about the answers I got, I arrived in the following conclusion. I'd like to know whether these make sense & are correct or...
  25. gfd43tg

    Window Tint Laws: A Tax on Freedom?

    This year, my state's governor signed into law requiring that windows are tested for tint in the annual vehicle safety inspection. The requirement for front windows in my state is 70% VLT. That is basically putting a layer of seran wrap on your window. I am a tinter and put 5% VLT (limo tint)...
  26. BillTre

    Enforcing Ethical AI: Proposed Laws for Regulation and Implementation

    Put here rather than in a computer forum because it is at the interface of computing and society. Many are familiar with Asimov's 3 Laws of Robotics: A robot may not injure a human being or, through inaction, allow a human being to come to harm A robot must obey the orders given it by human...
  27. LarryS

    I Conservation laws during particle decay?

    I believe that conservation laws, like for energy and momentum, are obeyed during the particle decay process, e.g. the total energy of the new output particles is equal to the energy of the one input particle. But is that relationship subject to quantum fuzziness? Suppose we, somehow, prepare...
  28. S

    B What is the process for developing new physical laws?

    Is it applying mathematics to a phenomena in the real world and create a model, test the implications of that model by manipulating the math, then checking that with observation and other established physical laws. If it doesn't match up, then a new model is required or another type of...
  29. E

    Question about Newton's Second and Third Laws

    Hey. I have watched a video byMIT explaining the Newton laws. I have however a question. I learned that The Force that object 1 has on object two is equal to the force object 2 has on object 1. In an example with a collusion between a train and a marble we were told that the force is equal to...
  30. E

    Equivalent capacitance and Kirchoff's laws

    Homework Statement [/B]Homework EquationsThe Attempt at a Solution I really have no idea how to proceed. Applying Kirchoff's laws to this would be quite lengthy. This circuit is supposed to be a wheatstone bridge but I can't see it.
  31. Pushoam

    I Laws of physics and inertial systems

    It is not the laws of physics, but the forms of laws of physics which are the same in all inertial frames. Comment."The forms of laws of physics are the same in all inertial frames" is a necessary condition (put by scientists ) to get satisfied by something which has to be called as a law of...
  32. M

    Explain speed limits on curved ramp with Newton's Laws

    Homework Statement Discuss how Newton’s Laws can be used to explain the introduction of transportation safety features such as: Speed Limits on curved ramps Homework Equations Newton's 2nd Law: F=ma The Attempt at a Solution I believe that according to Newton's first law objects that are in...
  33. J

    Circular Motion - Newton's Laws in different reference frames

    Homework Statement A child stands near the middle of a roundabout that is rotating with some angular velocity w. The child moves towards the edge of the roundabout in a straight line from the child's perspective and at constant speed. Explain in as much detail as you can (and using equations)...
  34. T

    Newton's Laws - Positive & negative direction

    Hi, While solving homework problems, I start by defining a positive-y direction and a positive-x direction. Let's say up and to the right. Until now, I've applied this same rule to all objects in each problem, no matter the direction the object moves. But it seems I have not understood this...
  35. V

    Friction -- Newton's laws of motion

    Homework Statement A student is cleaning a block board by moving a light duster up and down as shown. (Coefficient of friction between the duster and board is ##MU## The duster will not move no matter how large the force is if ? Homework Equations No equations given The Attempt at a Solution...
  36. V

    Newton's laws of motion -- finding the velocity of a Block in a pulley system

    Homework Statement Determine the speed with which block B rises in figures if the end of cord at A is pulled down with a speed of 2ms^-1 Homework Equations Given Velocity downwards at A=2m/s The Attempt at a Solution Really stuck... Couldn't even start the question solving...I know all...
  37. V

    Newton's laws of motion -- pulley system

    Homework Statement In the situation given all surfaces are friction less pulley is ideal and steering is light. Find accn of block 2 Homework Equations Given F=mg/2 The Attempt at a Solution .[/B] Got answer as G/2 instead of G/4 ...(actual answer is g/4) Since F=mg/2 and block 1 is hanging...
  38. V

    Newton's laws of motion -- Constaint motion

    Homework Statement In the following diagram a massless pulley is pulled by a constant force of magnitude P. There is no friction between the block and the floor. The acceleration produced in the block if mass m is? PIC ATTACHED Homework Equations Took a1/2=a2 where a1 is accn of block and a2...
  39. Alfredo Tifi

    I Is Time Reversal Symmetry Truly Fundamental?

    It is often told that fundamental laws are insensitive to +t/-t change. Let's try this one: a little mass m1 object is accelerating towards a big object M2, in -x direction in space and +t in time, due to gravity or following space-time free fall line (along a geodetic). Now, revert the video...
  40. davidge

    B Conservation of Newtonian Force and the Invariance of Maxwell's Equations

    The electromagnetic wave equation being of the same form in all intertial frames is because Newton's force is a vector quantity? I mean, if the wave equation changes its form from a intertial frame to another one, would the electromagnetic force be different in the two frames? I know that one...
  41. Asmaa Mohammad

    Using Kirchhof's laws to solve a circuit

    Homework Statement In the circuit shown in the figure (attached with the solution). Determine: 1. the reading of the ammeter when the key (K) is open. 2. The reading of the ammeter when the key (K) is closed. Homework EquationsThe Attempt at a Solution [/B] What confuses me in the circuit...
  42. Shakattack12

    Results make no sense regarding Kirchoffs laws?

    For an experiment we configured three 6V solar panels in parallel connected to a 10 ohm resistor. Each panels outputs roughly 0.5A each (measured) so that's 1.5A through the resistor. But the voltage across the resistor measure 15V. Does anyone know why this happened?
  43. Sullivan Stockwell

    B The Early Universe and the Laws of Physics

    I've heard it said multiple times on here and elsewhere that as we "wind back the clock" of our Universe and the Big Bang that our laws of physics kind of begin to fall apart, in a sense. If this is true, can anyone explain exactly which laws become more difficult to work with, and why? Thanks.
  44. G

    How to find Kepler's law from Newton's laws

    We were asked to do an experiment where we had to prove the equation: T2=(4π2m)/Mgr Where M is the mass of the mass stack in kg (0.3kg), m is the mass of the rubber bung in kg (0.0226kg), T is the time taken for one rotation in seconds, r is the horizontal radius of rotation in meters, and g is...
  45. F

    Gas Laws -- why calculate the mean square speed at 273K?

    Homework Statement Why is the formula ##p = \frac{1}{3}\rho<c^2>## used to calculate the mean square speed at 273K? Why 273K?
  46. shea

    A Physical Understanding of Kirchhoff's Laws

    < Mentor Note -- thread moved to the EE forum from the Homework forums since it is a more general set of questions > So, we are going into Kirchhoff's Laws in class, and my entire understanding of circuits, which took me a while to form, is again falling apart. A physical understanding is...
  47. W

    What Is the Highest Temperature Reached in the Ideal Gas Cycle?

    Question (see attached diagram): PV diagram with 7.5 moles of ideal diatomic gas through cycle a, b and c. What is the highest temperature reached by the gas during the cycle? (multiple choice answers 180, 325, 208 and 100 C, i know answer is 208 C but I'm not getting it!) It is a PV diagram...
  48. S

    A What Are the Possible Decay Processes of the W⁻ Boson?

    The decay processes of the ##W## bosons are completely governed by the charged current interaction terms of the Standard model: $$\mathcal{L}_{cc} = ie_{W}\big[W_{\mu}^{+}(\bar{\nu}_{m}\gamma^{\mu}(1-\gamma_{5})e_{m} + V_{mn}\bar{u}_{m}\gamma^{\mu}(1-\gamma_{5})d_{n})\\...
  49. T

    Do laws of thermodynamics really apply to ecosystems?

    From Odum (Father of modern ecology) Ecosystem follows the laws of termodynamics 1st law 2nd law The way the laws have been put it looks alright but they are valid for closed systems only which ecosystems are not. However according to wikipedia apart from having a closed system there are...
  50. Shardul Khare

    Understanding Newton's Laws of Motion: Exploring Block Movement and Friction"

    When a keep two blocks one over another...And apply a foce on the block which is below...Why does the upper block falls down..Why dosent it move with A? assumin there's no friction between A and B?
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