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  • 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
  • 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
  • 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
  • Why is kinetic energy conserved? - Physics Forums
    In the kind of collision you are considering, by construction all other energies are constant, therefore kinetic energy has to be conserved for the total energy to be conserved
  • Conservation of Momentum versus Conservation of Velocity - Physics Forums
    Energy and momentum are conserved for any system of particles (in the absence of external forces) The "conservation of velocity" applies to the centre of mass - although it's usually exemplified by the existence of a "zero momentum" or "centre of momentum mass" frame
  • Conservation of momentum cannon problem • Physics Forums
    The problem involves a cannon that fires a projectile, with considerations of momentum conservation, recoil speed, spring extension, and forces involved in the system The subject area includes mechanics, specifically conservation of momentum and spring dynamics Exploratory, Conceptual clarification, Mathematical reasoning The original poster attempts to understand the recoil speed of the
  • 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?
  • A Definition and Controversy of Energy - Physics Forums
    After all, energy is conserved and it can be moved from one system to another, just like you would expect from your everyday experience with “stuff Energy is not a thing with an independent existence
  • Understanding Kerr Black Holes: Metric, Killing Vectors Event . . .
    Discussion Overview The discussion centers on the properties of Kerr black holes, particularly focusing on the Kerr metric, Killing vectors, and event horizons Participants compare the Kerr metric to the Schwarzschild metric, exploring the implications of symmetry and the nature of conserved quantities in the context of general relativity Discussion Character Technical explanation Conceptual





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