Week 6 Energy, Momentum & Conservation of Energy Flashcards Preview

Y1S1 Quantum Physics and Relativity > Week 6 Energy, Momentum & Conservation of Energy > Flashcards

Flashcards in Week 6 Energy, Momentum & Conservation of Energy Deck (6)
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1

what are the Newtonian equations for momentum and kinetic energy and what is their problem under Lorentz transformations

p = mv
E = 1/2mv^2
they are not invariant under Lorentz transformations

2

why can we not use Newtonian momentum and kinetic energy equations for inertial reference frames

they are not invariant which contradicts the idea hat energy and momentum are always conserved which are laws of physics that must be obeyed in inertial reference frames

3

give the 4D momentum and energy equations

P = γmv
E = γmc^2

4

what is the invariant mass equation

E^2 = c^2p^2 + m^2c^4

5

when is the E = mc^2 + 1/2mv^2 energy conservation equation used

only when v << c

6

how does energy conservation work in relativity

only total energy is conserved