Under what conditions would kinetic energy not be conserved?
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.
916458
Kinetic energy is energy in motion and potential energy is energy at rest.
821839
potential cannot be associated with a non conservative force. potential energy is the energy which is stored inside the body when you do some work against that force. If it is a non conservative force, than the work done to move something to the same point through different paths will be different. Which means that potential at a given point may have more than one value which is practically impossible. That's why potential can never be associated with a non conservative force/field.
895448
Kinetic energy can be expressed as\n\nKE = 0.5*m*v^2\n\nDoubling the kinetic energy requires increasing the speed by the square root of 2. Where doubling the speed increases the energy by a factor of 4.
476031
Well, yes, neglecting any energy loss to friction (e.g. air resistance)
310103
Kinetic Energy:\n\nKinetic energy (SI unit: the joule) is energy that a body possesses as a result of its motion. It is formally defined as the work needed to accelerate a body from rest to its current velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. Negative work of the same magnitude would be required to return the body to a state of rest from that speed.\n\nIn simple cases, this work (and thus the kinetic enrgy) is equal to:\n\n    Ek =.5(M*(V^2))\nwhere m is the object's mass and v is the object's velocity.
468574
The conservation of energy rule in physics dictates that energy is always conserved, so it can't be destroyed merely changed to another type. Perhaps an example could be in a crash, the kinetic energy is turned into sound and heat energy primarily, but the energy still exists.
253742
Please take the time to\nvote for the best answer\n\nThank You!!\n\nRecall that an object of a certain mass moving with particular speed will have an associated kinetic energy  mass x speed2. An object spinning about an axis will also have associated with it a kinetic energy, composed of the kinetic energies of each individual part of the object. These individual contributions may be summed up to give an expression for the total kinetic energy of the spinning object: \n\nLook this up for more
44667
You have a contradiction in your statement.  Static friction implies no movement but velocity is movement.  \n\nIf you mean the velocity of an object in dynamic equilibrium has a result of a frictional force (kinetic though) like sliding a block across the floor then you have to know the amount of work put into the system.  Then use work-kinetic energy theorem.
838178
The answer should be A.\n\nAverage kinetic energy of a substance is related to the speed of the particles moving in it and the temperature of the substance.\n\nAs the particles in the a substance moves faster, the average kinetic energy of the substance increases.  So does the temperature.\n\nWhen a substance changes phase, the temperature will remain constant.  This means that the average kinetic energy is also constant during this process.  Hence, B is wrong.\n\nWhen thermal energy is being transferred out of the substance, one could understand it as taking out some particles out of the substance.  So what is changed here?  I would think that the total kinetic energy is being changed, since some particles have been taken away.  But the taking away of the particles would not affect the speed of the remaining particles.  The AVERAGE kinetic energy should remain unchanged.  Hence, C is also wrong.
975858
1. potential\n2. kinetic\n3. it left at 0\n4. friction\n5. the greater the mass, the less  distance\n\nYour source of errors and improvements must come from your lab
243705
1. Energy cannot be created or destroyed only changed in form. 2. The total energy of any closed system is = 0\n\nA static generator does not create energy it only changes its form from mechanical to electrical.  Search on the web for perpetual motion for a more in depth explanation.\nalso search thermodynamics, first and second laws.
638982
The kinetic energy changes proportionately to the dot product of the force and the direction of motion.  If the object is always moving at right angles to the force, there is no change in kinetic energy.\n\nThe most obvious example is a planet in a circular orbit around a star.  The star exerts a constant force on the planet, but the planet's kinetic energy never changes because the force is always perpendicular to the direction of motion.\n\nThis is a case where a non-zero net force results in no change in kinetic energy.
256338
a) when it it closest to the gravitational source\nb) when the potential energy is minimum (same as a)\nc) speed = |velocity|\nd) momentum(p)= mv\ne) KE = (mv^2)/2\nf) usualy the potential energy is defined as 0 at infitity\ng) conservation of energy\nh) when it it closest to the gravitational source\ni) conservation of angular momentum\n\nThat should be enouph to figure out the answers... but think about it and draw some pictures so that you know it is right.
809675
Force times distance is not kinetic energy. Force times distance is work. Work can appear in different forms. If you expend 100 Newton-meters of work pushing a dog very slowly up a frictionless inclined plane, the dog will have 100 Newton-meters of potential energy when you are done, and no kinetic energy, for it will stop moving when you stop pushing.\n\nOn the other hand, if you expend 100 Newton-meters of work pushing the dog along a horizontal frictionless slippy-slide, the dog will continue sliding after you stop. It will have no potential energy and 100 Newton-meters of kinetic energy.\n\nDo you want to know how fast the dog will be going when you stop pushing? Use\n\nE = (1/2) * m *  v^2
1171292
Sure, under non-equilibrium conditions.  Remember the Maxwell-Bolzmann energy distribution is only fixed at equilibrium...and thus the concept of "temperature" is only valid under equilibrium conditions.\n\nHowever, under pseudo-equilibrium conditions you can see a variance.  You may get one "temperature" for translational energy, and different (higher) "temperatures" for rotational and vibrational energies.\n\nYou can see this in supersonic expansions of gases into a vacuum.  The collision rate drops so rapidly that the higher "temperatures" of the rotational and vibrational energies are frozen in...no collisions are available to establish a true equilibrium w/ the translational energies.
335215
Kinetic energy.\n\nGreek kntikos, from kntos, moving, from knein, to move.