What is the law of physics attached to perpetual motion?
86254
I am thinking the laws of thermodynamics, but its been a long time since physics class.
895025
no. there is no such case , theroretically. because, according to the law of conservation of energy the total energy in any closed system is constant. however practically some energy is dissipated in a practical case.
733729
http://en.wikipedia.org/wiki/Newton%27s_law_of_universal_gravitation
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The two principal laws of thermodynamics apply only to closed systems, that is, entities with which there can be no exchange of energy, information, or material. The universe in its totality might be considered a closed system of this type; this would allow the two laws to be applied to it.\n\nThe first law of thermodynamics says that the total quantity of energy in the universe remains constant. This is the principle of the conservation of energy. The second law of thermodynamics states that the quality of this energy is degraded irreversibly. This is the principle of the degradation of energy.\n\nThe first principle establishes the equivalence of the different forms of energy (radiant, chemical, physical, electrical, and thermal), the possibility of transformation from one form to another, and the laws that govern these transformations. This first principle considers heat and energy as two magnitudes of the same physical nature\n\n\nThere seems to be a contradiction between the first and second principles. One says that heat and energy are two dimensions of the same nature; the other says they are not, since potential energy is degraded irreversibly to an inferior, less noble, lower-quality form--heat. Statistical theory provides the answer. Heat is energy; it is kinetic energy that results from the movement of molecules in a gas or the vibration of atoms in a solid. In the form of heat this energy is reduced to a state of maximum disorder in which each individual movement is neutralized by statistical laws.\n\nPotential energy, then, is organized energy; heat is disorganized energy. And maximum disorder is entropy. The mass movement of molecules (in a gas, for example) will produce work (drive a piston). But where motion is ineffective on the spot and headed in all directions at the same time, energy will be present but ineffective. One might say that the sum of all the quantities of heat lost in the course of all the activities that have taken place in the universe measures the accumulation of entropy. \n\nOne can generalise further. Thanks to the mathematical relation between disorder and probability, it is possible to speak of evolution toward an increase in entropy by using one or the other of two statements: "left to itself, an isolated system tends toward a state of maximum disorder" or "left to itself, an isolated system tends toward a state of higher probability." (this is illustrated most simply by the example of the box with two compartments). \n\nThe concepts of entropy and irreversibility, derived from the second principle, have had a tremendous impact on our view of the universe. In breaking the vicious circle of repetitiveness in which the ancients were trapped, and in being confronted with biological evolution generating order and organization, the concept of entropy indirectly opens the way to a philosophy of progress and development (see: the direction of evolution). At the same time it introduces the complementarity between the "two great drifts of the universe" described in the works of Bergson and Teilhard de Chardin.\n\n\nMore details at the link below :--
284291
If you could shoot a rocket into outer space with enough force to cause it to leave our solar system, perhaps it would exhibit "perpetual motion" and travel forever.  But that would be deceptive.  It would continue to move unchanged only because it meets little matter or force to overcome.  On earth, to set something into motion you must add to its kinetic energy which equals one half times its mass times its velocity squared.  It doesn't matter how you add the energy (or that it gains more say by falling) we are interested only in the energy you added to create perpetual motion.  It could revolve say suspended above powerful frictionless magnets within the vacuum inside an evacuated bell jar for a very long time.  However, there is no perfect vacuum on earth and there would still be atoms or molecules that would collide with and slow down the rotating item whether that took hours or days or years.  Perpetual motion must last forever(!) without you or Nature adding to its original kinetic energy.  If you hold your hand outside a moving car you will feel wind on your hand and some reasoon it could be harnessed (like a sail boat) to propel the car, neglecting the fact that the wind exists solely because the car is burning fuel.  Out of gas = out of wind.\n\nI would encourage you to pursue your theory for the lessons involved but carefully account for all the energy.  Consult with any engineer (especially mechanical at first) or any physics teacher (professor) and remember that your theory could involve a better use of energy if not perpetual motion.  You must patent most devices within a year of public disclosure (which would not include a witness to your theory or device).  Good luck.
210438
the newton's three laws of motion are as follows: law of inertia ( an object at rest will stay at rest unless acted by an outside force, a moving will continue on ots motion unless acted by an outside force), law of acceleration ( thw acceleration of a body is directly propotional the force and inversely proportional to its mass: a=f/m) and the law of interaction ( in every action there is always an equal and opossite rreaction)
103558
Kinetic energy is almost never conserved. There is friction, and conversion of kinetic energy to potential energy, for example.\n\nI think you are referring to conservation of energy, not kinetic energy. The law of conservation of energy is allowed to be violated but only for very short periods of time, by the Heisenberg Uncertainty Principle.
783676
Newton's Laws of Motion describe only the motion of a body as a whole and are valid only for motions relative to a reference frame. \nFirst law - An object at rest tends to stay in rest and an object in motion tends to stay in motion in a straight line at constant speed unless acted upon by an external, unbalanced force - like those big propellers. \nSecond law - The rate of change of momentum of a body is proportional to the resultant force acting on the body and is in the same direction. Which is why a really big submarine needs really big propellers to go.\nThird law - To every action (force applied) there is an equal but opposite reaction (equal force applied in the opposite direction).   So if the propeller pushes against the water one way, the propeller and the ship it is attached to move the other way.
148999
Zeroth Law of Thermodynamics: If two systems are in thermal equilibrium with a third system, then they are in thermal equilibrium with each other. \nOr if systems A and C are in equilibrium and systems B and C are in equilibrium, then A and B are also in equilibrium.\n\nFirst Law: The increase in the internal energy of a system is equal to the amount of energy added to the system by heating, minus the amount lost in the form of work done by the system on its surroundings. \nBasically, the first law is just a statment of energy conservation.\n\nThe Second Law combines two statements. \nThe Kelvin-Planck statement says "It is impossible to construct a device that will operate in a cycle and produce no effect other than the raising of a weight and the exchange of heat with a single reservoir."\nThe Clausius statement says "It is impssible to construct a device that operates in a cycle and produces no effect other than the transfer of heat from a cooler body to a hotter body."\nThese statements combine to say that it is impossible to have heat transfer without losses. It is impossible to move heat, by a cyclical process, from something at lower temperature to something at higher temperature unless work is added to the system.\nEntropy is defined as the "capacity for change" of a system. The second law says that in any process the change in entropy is always greater than zero.\n\nThird Law:  As a system approaches the temperature of absolute zero all processes cease and the entropy of the system approaches a minimum value or zero. But according to the second law, entropy must always be greater than zero, SO temperature can never be at absolute zero.
534463
All kinds of things. All of a cars mechanisms are based on physical laws. I suppose this is for a school project so it might be enough if you talk about speed, acceleration etc...and maybe about the chemical energy that is being converted to heat energy which is being converted to kinetic energy (in school terms). When going through a curve you can talk about centripetal acceleration etc etc
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Cold fusion : http://arstechnica.com/journals/science.ars/2006/3/8/3099\n\nPerpetual motion:\nhttp://patentpending.blogs.com/patent_pending_blog/2004/12/perpetual_motio.html\n\nMale performance enhancers:\nhttp://www.themediadesk.com/files/enhancements.htm
58782
Newton's Laws of motion.Everything continues in its state of rest or motion unless acted upon by an external unbalanced force.
226939
First Law of Thermodynamics: Energy can be changed from one form to another, but it cannot be created or destroyed. The total amount of energy and matter in the Universe remains constant, merely changing from one form to another. The First Law of Thermodynamics (Conservation) states that energy is always conserved, it cannot be created or destroyed. In essence, energy can be converted from one form into another.\nWhen electrical fan is rotating, electrical energy is transformed to mechanical energy.\nEntropy and the Second Law of Thermodynamics\nThe second law of thermodynamics (the entropy law or law of entropy) was formulated in the middle of the last century by Clausius and Thomson following Carnot's earlier observation that, like the fall or flow of a stream that turns a mill wheel, it is the "fall" or flow of heat from higher to lower temperatures that motivates a steam engine. The key insight was that the world is inherently active, and that whenever an energy distribution is out of equilibrium a potential or thermodynamic "force" (the gradient of a potential) exists that the world acts spontaneously to dissipate or minimize. All real-world change or dynamics is seen to follow, or be motivated, by this law. So whereas the first law expresses that which remains the same, or is time-symmetric, in all real-world processes the second law expresses that which changes and motivates the change, the fundamental time-asymmetry, in all real-world process. Clausius coined the term "entropy" to refer to the dissipated potential and the second law, in its most general form, states that the world acts spontaneously to minimize potentials (or equivalently maximize entropy), and with this, active end-directedness or time-asymmetry was, for the first time, given a universal physical basis. The balance equation of the second law, expressed as S > 0, says that in all natural processes the entropy of the world always increases, and thus whereas with the first law there is no time, and the past, present, and future are indistinguishable, the second law, with its one-way flow, introduces the basis for telling the difference. \nThe active nature of the second law is intuitively easy to grasp and empirically demonstrate. If a glass of hot liquid, for example, is placed in a colder room a potential exists and a flow of heat is spontaneously produced from the cup to the room until it is minimized (or the entropy is maximized) at which point the temperatures are the same and all flows stop.\nThird Law of Thermodynamics\n\nThe third law of thermodynamics states that if all the thermal motion of molecules (kinetic energy) could be removed, a state called absolute zero would occur. Absolute zero results in a temperature of 0 Kelvins or -273.15° Celsius.\n\nAbsolute Zero = 0 Kelvins = -273.15° Celsius\nThe Universe will attain absolute zero when all energy and matter is randomly distributed across space. The current temperature of empty space in the Universe is about 2.7 Kelvins.\nAt the absolute zero of temperature, there is zero thermal energy or heat. Since heat is a measure of average molecular motion, zero thermal energy means that the average atom does not move at all. Since no atom can have less than zero motion, the motion of every individual atom must be zero when the average molecular motion is zero. When none of the atoms which make up a perfectly ordered crystal move at all, there can be no disorder or different states possible for the crystal
515678
The conservation law states that energy is neither created nor destroyed but merely changes type. So, when an object slows down it has less kinetic energy and that energy is converted to heat by way of friction.
413533
Props to mathematician.  To expand, a "machine" must transform energy in some way.  The second law of thermodynamics describes that any time energy is transformed, entropy is created.  Whenever entropy is created, the "machine" must expel some energy in order to expel the entropy that has been created (if it doesn't expel the entropy, the machine doesn't run).  So every time a machine does something, it MUST lose some energy, and it cannot run forever.
552079
-the total is constant. One common phrasing of this is that energy cannot be created or destroyed.
974804
It won't work.  You can look at it this way:\n\nOne of the basic laws of physics is Conservation of Energy.  You can't create energy, nor is energy lost.  It is always constant, but it may change form.  Let me give several examples.\n\nThe energy associated with a swinging pendulum changes from kinetic (moving) energy at the bottom of the swing to potential energy at the top of the swing.  Back and forth, kinetic energy, potential energy, kinetic energy, potential energy, etc.  The swing of the pendulum does slowly die down, but that is due to the gradual transfer of kinetic energy to the surrounding air in the form of heat.\n\nIn the second example, the kinetic energy of a moving car is converted to thermal energy (heat) when you hit the brakes.  That's why your brakes get hot if you've been doing a lot of braking.  Of course, to get the car moving in the first place, the engine converts chemical energy from gasoline to thermal energy, which expands the gases in the pistons, pushing on the pistons to make the mechanical energy that turns the wheels.\n\nBack to your problem.  To charge a battery, the energy must come from somewhere.  The amount of energy coming from your voice is small, and certainly the amount of energy picked up by a microphone is much smaller, since most of the energy goes right on past the microphone.  It would take a very strong voice and a lot of talking to charge a battery, even if the charging circuit were perfect with no losses.\n\nNow, if your voice could turn a windmill.........