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  • How is momentum conserved if you lose kinetic energy?
    The discussion revolves around the conservation of momentum in the context of inelastic collisions, specifically addressing how momentum can be conserved while kinetic energy is lost Participants explore the mathematical relationships between momentum and kinetic energy, the implications of energy dissipation, and the conceptual understanding of these physical quantities Some participants
  • Why Isnt Kinetic Energy Always Conserved with Momentum?
    The discussion revolves around the conservation of momentum and kinetic energy in physical interactions, particularly in the context of collisions The original poster seeks clarification on why kinetic energy is not always conserved when momentum is conserved, as stated in their textbook Conceptual clarification, Assumption checking, Mixed Participants explore the relationship between
  • Why momentum is conserved when a gun fires? (conceptual question)
    The discussion centers around the conceptual understanding of momentum conservation in the context of a gun firing Participants explore the implications of Newton's third law, the definition of closed systems, and the role of external forces in analyzing momentum before and after the shot Some participants assert that conservation of momentum is linked to action and reaction pairs as
  • Spinning Bike Wheel Example, how is angular momentum conserved . . .
    Some participants assert that angular momentum is conserved in the system of the person, chair, and wheel, but question how angular momentum can be added when the wheel and person are about different axes
  • Is momentum conserved as a body falls through a gravitational field?
    There is a conserved energy, called "energy at infinity", which can be interpreted as kinetic energy + potential energy in the Earth's rest frame; and there is a conserved angular momentum
  • How is energy conserved in General Relativity? - Physics Forums
    EDIT: Specifically, I know one could associate a "total energy" (including gravitational) to the quantity and this quantity is conserved along geodesics But how to deconstruct that into part Gravitational Potential energy and part "other" energy (kinetic energy rest energy) is not apparent to me
  • When are the initial and final momentums the same (conserved . . .
    In a system with no external force like gravity, the final and initial momentums are conserved If we have a firework that explodes radially (disregarding gravity), the momentum before the explosion should equal the momentum after explosion But isn't the explosion caused by an external force?
  • What do you need to establish that spin is conserved?
    The discussion centers on the conditions necessary to establish that spin is a conserved quantity in quantum mechanics Participants explore the relationship between spin and angular momentum, and the contexts in which spin conservation may or may not apply One participant questions what is needed to assert that spin is conserved, noting that spin lacks a clear classical interpretation and is
  • Did scientists just find that the Universe has finite angular momentum?
    I get the idea that "in average scientists would expect to find 50% of galaxies rotating one way, while the other 50% rotate the other way" but that is not what physics says, for me the important thing is that angular momentum is conserved, right? So counting the signs of the galaxies can be misleading isn't?





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