Under what conditions would kinetic energy not be conserved?
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.
1065659
It is not possible unless there is some external force to initiate or continue the movement. The initial movement will get off set and reduced  in course of time.
1108031
Kinetic 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 velocity.
284573
good link below\n\nhttp://en.wikipedia.org/wiki/Kinetic_theory
835640
Actually, it is "conservation", NOT "conversation" of momentum, which means that the total momentum of a closed physical system (i.e. no external forces acting on the system) remains the same always, no matter what happens over time.
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.
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.
767789
decrease potential energy.....through physical factors like friction....
816105
Generally, some of their collective kinetic energy is converted into heat, so the KE after the collision is less than the initial KE.  Momentum is conserved.
827118
We can't use conservation of energy because this is an inelastic collision. Conservation of momentum does hold, so\n\nm1*u1 + m2*u2 = (m1+m2)*v\n\nu2 is zero. So \n\nv = m1*u1/(m1+m2) = .24 kg*u1/2.85 kg = .084*u1\n\nThe projectile's incident kinetic energy \nKEp = (1/2)*m1*u1^2 = 0.12*u1^2 joules\nThe final kinetic energy \nKEf = (1/2)*(m1+m2)*v^2 = 1.42*(.084*u1)^2 = .0100*u1^2 joules.\n\nPercentage = 100%*KEf/KEp
476031
Well, yes, neglecting any energy loss to friction (e.g. air resistance)
1121031
yes, e.g. a braking car. \nOf course, you can't have accelaration and velocity going in opposite directions forever - the velocity will change to direction of acceleration eventually.
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.
855353
kinetic energy is the energy possessed by a body in virtue of its motion\npotential energy is for example the energy of water \nat the top of a waterfall before it is\nconverted to kinetic energy after it goes\nover the edge of the waterfall\ngravitational energy is the potential \nenergy possessed by a body\nby virtue of its height above sea level \nan example of this is the space shuttle \nusing the frictional resistance of the \natmosphere to convert the gravitational\nand kinetic energy into heat in order to land\n\ni hope that this helps
34585
The equations of motion you are using are good equations, but aren't going to answer your question.  What you want to know is the energy of the moving object.  \n\nThe kinetic energy of a moving object is E = (1/2)m*v^2.  From this equation you can see that if you double the velocity, the energy quadruples.  Stopping an object with four times the kinetic energy will take 4 times the distance.
399478
as long as mass is constant, the velocity of a body is constant. Newton's law.\n\nBut the word "conservation" does not mean constant. \n\nIf the velocity is transfered with out change, we can say it is conserved. This happens only in very few cases; elastic collision of equal masses.\n\nBut to cover that there is conservation of momentum.
137603
Consider  one small part of the dancing string:\nelastic energy <==> kinetic energy.\nThe sum of both is mechanical energy.\nIt is supposed to be constant.\n\nOnly the friction of the air damps the oscillations.\nMechanical energy ==> (friction) heat\nThat's all foulks!