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. D

    Solve Newtons Laws Problem: Friction and Acceleration

    Homework Statement a box of Cheerios (mass mC = 1.1 kg) and a box of Wheaties (mass mw = 3.6 kg) are accelerated across a horizontal surface by a horizontal force applied to the Cheerios box. The magnitude of the frictional force on the Cheerios box is 1.6 N, and the magnitude of the...
  2. C

    Is conservation laws are more fundamental than Newton's second law?

    Is conservation laws are more fundamental than Newton's second law in Newtonian mechanics? I know from the point of view of Noether's theorem conservation laws are more fundamental. But all the conservation laws can be derived from the F= ma equation. And from these conservation laws I can't...
  3. L

    Newtons Laws applyied to pulleys

    Homework Statement There is a drawing with a block weight 416N on a table attached to a string that is running through a pulley at the end of the table. On the other end of the string a block that is hanging off the side of the table with a weight of 215N. Ignore all frictional effects and...
  4. B

    Newton's laws question [grade 12]

    Homework Statement A tree house has a vertical "fire pole" of smooth metal, designed for quick exits. A child of mass 35.7 kg slides down the pole with constant acceleration, starting from rest. The pole is 3.10m high. The journey to the ground takes 2.00s. a) what is the magnitude of the...
  5. Chewy0087

    Solving Kirchoff's Rules Homework: Questions on Dimmer/Normal/On/Off

    Homework Statement Homework Equations Kirchoff's Rules The Attempt at a Solution hey there! i'm having trouble with parts of the question above; for the first two a: dimmer, b: normal. however for c & d I'm confused, I did ask my teacher however he wasn't helpful at...
  6. J

    How Do You Calculate Tension in a Tow Rope for a Car on a Ramp?

    Homework Statement A 1500-kg car is dragged up a 20 degree rough ramp by a tow truck. The coefficient of static and kinetic friction between the car and the ramp are 0.8 and 0.5 respectively. Assume that wheels are locked. *Note: picture of a sedan pulled up a ramp with a rope. Find the...
  7. B

    Newton's Laws - friction, tension, acceleration

    Newton's Laws -- friction, tension, acceleration A block of mass m1 = 2 kg and a block of mass m2 = 3 kg are tied together and are pulled from rest across the floor by a force of Fp = 24 N. The coefficient of friction of the blocks with the floor is μ = 0.27. a) What is the acceleration of...
  8. D

    Why do both Coulomb and Gravity follow 1/r^2 laws?

    I am wondering why both Coulomb and Classical Gravity follow 1/r^2 laws. Weak and Nuclear force fall off at much faster distance scales! Does anyone know why it is that both Coulomb and Gravity have 1/r^2 strength, while the other forces have different distance scales?
  9. I

    Non-Equilibrium Applications of Newtons Laws

    1. In the drawing, the weight of the block on the table is 388 N and that of the hanging block is 175 N. Ignore all frictional effects, and assuming the pulley and the cord to be massless. Find the acceleration of the two blocks as well as the tension in the cord 2. Fnet = mass of the...
  10. S

    Applications of Newtons Laws (friction)

    Homework Statement At the airport, you pull a 18-kg suitcase across the floor with a strap that is at an angle of 45 deg above the horizontal. Find a) Normal force and b) the tension in the strap, given that the suitcase moves with constant speed and that the coefficient of kinetic...
  11. L

    Newtons Laws of Motion Question

    Homework Statement Paleontologists estimate that if a Tyrannosaurus rex were to trip and fall, it would have experienced a net force of approximately 256,700 N acting on its torso when it hit the ground. Assume the torso has a mass of 3710 kg. (a) Find the magnitude of the torso's upward...
  12. M

    How Is the Mass of Block B Calculated in a Friction-Affected Pulley System?

    Homework Statement In figure 6-36, two blocks are connected over a pulley. The mass of block A is mA and the coeffcient of kinetic friction between A and the incline is Uk. Angle of the incline is theta. Block A slides down the incline at constant speed. What is the mass of block B? Express...
  13. Does a machine like this violate laws of thermodynamics?

    Assuming a machine such that it produces blocks of negative and positive mass from vacum, and it uses the produced positive mass to power all these procedure such that it forms a perpetrual motion machine. would it be theoredcally posible to do this with the positive mass produced in the...
  14. L

    Getting Empirical Forumula Using Ideal Gas Laws

    Homework Statement CxHy gets burned in oxygen gas and makes CO2 and water. Given the partial pressure of water and the total pressure of the resulting mixture I need to find the empirical formula. Homework Equations Well PV=nRT is the obvious choice...but all the information you see...
  15. N

    Applying Newtons laws (intro to physics problem)

    A 20000 rocket has a rocket motor that generates 3.0×105 of thrust. What is the rocket's initial upward acceleration? Express your answer using two significant figures. At an altitude of 5.0 km the rocket's acceleration has increased to 6.0 m/s^2 . What mass of fuel has it burned...
  16. N

    How large is the normal force? (applying Newtons laws phys )

    how large is the normal force? (applying Newtons laws phys 1111) A 23 kg child goes down a straight slide inclined 38 degrees above horizontal. The child is acted on by his weight, the normal force from the slide, kinetic friction, and a horizontal rope exerting a 30 N force as shown in the...
  17. H

    Two-loop circuit using Kirchoff's Laws

    Homework Statement The circuit in the figure is composed of two batteries (ε1 = 10 V and ε2 = 5 V) and four resistors (R1 = 110 Ω, R2 = 40 Ω, R3 = 40 Ω, and R4 = 50 Ω) as shown. HELP: Because of the presence of batteries in more than one branch of the circuit, parts (a) and (b) of this...
  18. N

    Proving De Morgan laws inductively?

    How can I prove <by induction> the following De Morgan laws are valid for all n >= 2 - ( P(d1) ^ ... ^ P(dn) ) = ( - P(d1) ) v ... v ( - P(dn) ) knowing that -(p^q)=(-p)v(-q) and -((p)v(q))=(-p)^(-q) ? I can use the inductive proof method on algebra/math theorems that have to do with...
  19. R

    Laws of Conservation of Energy

    (Please make it a bit easy for a newbie student) Law of Conservation of Energy states that energy can neither be created nor be destroyed. Then how did it ever come into being? Thanks
  20. R

    Laws of Motion w/ Friction - Two Forces on Two Boxes

    Homework Statement A force of 38.64 N pushes and pulls two blocks as shown in the figure below. The vertical contact surfaces between the two blocks are frictionless. The contact between the blocks and the horizontal surface has a coefficient of friction of 0.18. The acceleration of...
  21. T

    Define Newton's 1st, 2nd, and 3rd laws

    1. Define Newton's 1st, 2nd, and 3rd laws and give examples of each 2. How can you change from weight to mass and back with correct units? 3. Explain free fall - tell what happens when a feather and a hammer and dropped at the same height and why this happens
  22. M

    How Is Tension Calculated in an Atwood's Machine?

    Homework Statement The figure shows two blocks connected by a cord (of negligible mass) that passes over a frictionless pulley (also of negligible mass). The arrangement is known as Atwood's machine. Block 1 has mass m1 = 0.900 kg; block 2 has mass m2 = 2.70 kg. What is the tension in the...
  23. M

    Newton's Laws with Friction: Two Blocks

    Homework Statement Part 1 Two blocks are in contact on a frictionless table. A horizontal force F is applied to M2, as shown. If M1 = 1.03 kg, M2 = 3.40 kg, and F = 5.10 N, find the size of the contact force between the two blocks...
  24. N

    How can Kirchoff's first law be applied to electrical circuits?

    According to Kirchoff's first law for electrical circuits V=RI+L(dI/dt) where constants V, R and L denote the electromotive force, the resistance, and the inductance, respectively, and I denotes the current at time t. If the electromotive force is terminated at time t=0 and if the current is...
  25. D

    Kinematics Newton's Laws Question

    Suppose the cord in Fig. 4-22 is a heavy rope of mass 1.0 kg. Calculate the acceleration of each box and the tension at each end of the cord, using the free-body diagrams shown in Fig. 4-46. Assume the cord doesn't sag. (m1 = 10.5 kg , m2 = 12.5 kg and FP = 35.0 N) m1 stands for the mass of...
  26. A

    Kirchoff's laws, emf and internal resistance

    Homework Statement two identical cells of emf E and internal resistance r are connected in series. a 7 ohm resistor is connected across the combination and draws a current of 0.333A. the two cells are now connected in parallel; the 7 ohm resistor now draws a current of 0.375A from the...
  27. A

    Question about Newton's laws, solving for distance given slope and speed.

    1. A car coasts (engine off) up a 30 degree grade. If the speed of the car is 25 m/s at the bottom of the grade, what is the distance traveled before it comes to a rest? 2. mostly my class so far has dealt with equations calculating work and force by drawinf free body diagrams and using...
  28. TheStatutoryApe

    Do Laws Deter Crime? Education vs Fear

    Laws only seem to go so far in getting people not to commit crimes against each other. I believe it has already been studied and established that the role of punishment to make an example as prevention is negligible. People who do not commit crimes because of the law are people living in fear...
  29. WaveJumper

    A challenge to the symmetry of laws of physics

    "It's the planet that really shouldn't exist – or at least not for long. It is 10 times the size of Jupiter, orbits its own star in under 24 hours and should soon be spiralling into the surface of its searingly-hot sun..." Full story...
  30. C

    How Do Newton's Laws Apply to Real-World Physics Problems?

    Homework Statement 1) A freight train has a mass of 1.5 x 10^7 kg. If the locomotive can exert a constant pull of 7.5 x 10^5 N, how long does it take to increase the speed of the train from rest to 80 km/h? 2) A 5.0 g bullet leaves the muzzle of a rifle with a speed of 320 m/s. What force...
  31. R

    Quantum corrections to force laws

    For the free photon-field: Z[J]=exp(\frac{i}{2} \int d^4x \int d^4y J^\mu(x)\Delta_{\mu \nu}} (x-y) J^\nu(y)) where \Delta_{\mu \nu}}=g_{\mu \nu}/(k^2-i\epsilon) is the free-photon propagator. This leads to Coloumb's law for the electrostatic energy between two charges at x_1 and x_2 when...
  32. M

    A question of the Intercompatibility of the Gas Laws.

    I was recently taught about the three gas laws: 1)Boyle's Law, which stated that pressure is inversely proportional to volume and vice-versa at a constant temperature. 2)Charle's Law, which stated that volume is directly proportional to temperature at a a constant pressure...
  33. C

    On self-defining laws of physics

    This is a line of thought arising out of quantum physics – specifically, from the principle that to the extent something is not actually measured or observed, it can best be described as a superposition of all its possibilities. A simple scenario for how the world began: Suppose we...
  34. B

    How Do Friction Coefficients Affect Acceleration on a Frictionless Surface?

    Homework Statement A 4.0-kg toboggan rests on a frictionless icy surface, and a 2.0 kg block rests on top of the toboggan. The coefficient of static friction µs between the block and the surface of the toboggan is 0.60, whereas the kinetic friction coefficient is 0.51. The block is pulled...
  35. B

    Calculating Acceleration with Friction and Inclined Forces

    Homework Statement A 4.1-kg box is pushed along a horizontal floor by a force of magnitude 21 N at an angle θ = 35° with the horizontal. If the coefficient of kinetic friction between the block and the floor is 0.20, calculate the acceleration of the box. Be careful when calculating the...
  36. C

    How do I solve for t using the Laws of Logs in this algebraic equation?

    I need to solve for t and it's slipped my mind how to manipulate this. \frac{1}{4}=te^{-8t} to ln(1/4)=lnt-8t I understand the laws of logs (I think), but I still can't seem to isolate the t.
  37. C

    What Is the Maximum Acceleration a Plane Can Have Without a Coffee Cup Sliding?

    Homework Statement A cup of coffee is sitting on a table in an airplane that is flying at a constant altitude and a constant velocity. The coefficient of static friction between the cup and the table is 0.30. Suddenly, the plane accelerates, its altitude remaining constant. What is the maximum...
  38. C

    Forces and Newton's Laws of a train

    Homework Statement A train consists of of 50 cars, each of which has a mass of 6800 kg. The train's acceleration = 0.08 m/s(squared). Ignore friction and determine the tension in the coupling (a) between the 30th and 31st cars and (b) between the 49th and 50th cars. Homework Equations Net...
  39. C

    Is gravity significant in this scenario?

    Homework Statement A large gun accelerates a 5.0 kg mass from rest to a speed of 4000 m/s into orbit. The net force accelerating the bullet is 490,000 N. How long will it take the projectile to come up to speed? It doesn't say anything above air resistance or gravity. Homework Equations...
  40. S

    Newton's Laws, Force and Kinematics

    Homework Statement A particle is traveling in a straight line at a constant speed of 24.5 m/s. Suddenly, a constant force of 14.3 N acts on it, bringing it to a stop in a distance of 52.9 m. a. Determine the time it takes for the particle to come to a stop. b. What is its mass? Homework...
  41. D

    This invention should work ELSE the conservation laws are wrong.

    Last time people concluded that 'I proved the law of conservation of energy and momentum wrong by my invention'...but the reality is strictly opposite. If this invention DOES NOT work THEN then 2 laws are wrong. This invention follows all rules and regulation governed by the physics book...
  42. V

    Laws of nature, and creatures like us.

    The following is something i read, and attempt to reproduce. I made no claim for originality. For anyone that wants the title of the book, and page number. I will find it, and post it. ( I remember the author is an adjunt professor at rockefeller university) The universe U is a computer...
  43. P

    Force (Newtons Laws of Motion)

    Homework Statement For a birthday gift, you and some friends take a hot-air balloon ride. One friend is late, so the balloon floats a couple of feet off the ground as you wait. Before this person arrives, the combined weight of the basket and people is 1220 kg , and the balloon is neutrally...
  44. P

    Force (Newton's laws of motion)

    When two people push in the same direction on an object of mass {\rm m} they cause an acceleration of magnitude a_1. When the same people push in opposite directions, the acceleration of the object has a magnitude a_2. Determine the magnitude of the force exerted by each of the two people in...
  45. O

    Theory questions about Newton's Laws and Gravitation

    I'm trying to figure out these two problems and I'm so lost! 1. Two planets are circling a star. The second planet has an orbit 4 times the size of the first planet. By the time the first planet revolves once, how many times the second one will? My solution: the formula is T=2PiR/v... so...
  46. R

    Newton's laws and non inertial frame of reference

    Hi all Why do we actually say that Newton's laws do not hold for non inertial frames. can you folks give me an example of how Newton's laws collapse in an non inertial frame(if they do at all)
  47. S

    Laws of Motion in weight lifting

    Hi all, I'm trying to get my head round how to apply Newtons laws and an exercise like a bench press, probably a bit simple to what you guys are used to. I want to make it as simple as possible to understand what forces would be acting during the eccentric phase of an exercise, I.e lowering...
  48. C

    Applying Newton's Laws: Crate on an Inclined Ramp

    Homework Statement In the figure, a crate of mass m = 96 kg is pushed at a constant speed up a frictionless ramp (θ = 27°) by a horizontal force F. The positive direction of an x-axis is up the ramp, and the positive direction of a y-axis is perpendicular to the ramp. (a) What is the magnitude...
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