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