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  • lagrangian formalism - Intuitive explanation for why time-translation . . .
    10 According to Noether's Theorem, every physical symmetry leads to a conservation law For example, time-translation symmetry (the laws of physics don't change over time) implies conservation of energy, and space-translation symmetry (the laws of physics are the same everywhere) implies conservation of momentum
  • newtonian mechanics - Does momentum conservation imply energy . . .
    If you want to disprove the proposition "momentum conservation implies energy conservation", then what you want is a situation in which momentum conservation holds, but energy conservation doesn't Not the other way around Maybe your question title is backwards: Does energy conservation imply momentum conservation?
  • Proof of conservation of energy? - Physics Stack Exchange
    In general relativity conservation of energy-momentum is expressed with the aid of a stress-energy-momentum pseudotensor The theory of general relativity leaves open the question of whether there is a conservation of energy for the entire universe For cosmological matters see another entry in this forum on the law of conservation of energy
  • kinematics - How can momentum but not energy be conserved in an . . .
    Kinetic energy does not need to be conserved, because it can turn into other forms of energy - for example potential energy or internal thermal energy ("heat") Momentum can also turn into other form of momentum - momentum of the EM field - but the amount of momentum so transformed seems negligible in ordinary collisions of macroscopic bodies
  • Proof Of Conservation Of Energy - Physics Stack Exchange
    4 We can treat conservation of the sum of potential energy and kinetic energy as a theorem of newtonian mechanics The following derivation starts with the case where a single force is acting, and there is a single degree of freedom Towards the end the generalization to multiple degrees of freedom is discussed
  • Why cant energy be created or destroyed? - Physics Stack Exchange
    My physics instructor told the class, when lecturing about energy, that it can't be created or destroyed Why is that? Is there a theory or scientific evidence that proves his statement true or f
  • Where does gravity get its energy from? - Physics Stack Exchange
    According to the law of conservation energy can't be created or destroyed and the kinetic energy comes from the gravitational pull so where does the gravitational pull gets its energy If that energy isn't being recycled from some where else then that means you have just created energy, therefore breaking the law of conservation
  • newtonian mechanics - Energy conservation for a rolling rigid body . . .
    At position A, body will have rolling kinetic energy and by conservation of energy, this rolling kinetic energy is converted into potential energy at position B $$\frac {1} {2}mv^2 (1+\frac {k^2} {r^2})=mgh$$ where k is radius of gyration I solved this equation for conservation of energy But it turns out this equation isn't correct
  • Conservation of kinetic energy in perfectly Elastic collision
    By the very definition of an elastic collision, both kinetic energy and momentum are conserved If it were any collision, you are certain that if no net external forces are acting on the system, the initial momentum equals the final momentum However, only in perfectly elastic collisions is the kinetic energy conserved
  • What happens to the energy when waves perfectly cancel each other?
    147 What happens to the energy when waves completely cancel each other out via destructive interference? It seems like the energy just disappears, but that would violate the law of energy conservation My guess is that the kinetic energy is transformed into potential energy





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