Astrophysics (Index)About

kinetic energy

(KE)
(an object's energy due to its motion)

Kinetic energy is the energy an object has due to its motion. For example, an object coasting along a sheet of ice could be tied via a pulley to a weight and lift the weight, i.e., the energy of the object's motion used to do some work. Classical formula:

      1
ke = ——— mv²
      2

Relativistic:

          mc²
ke = ————————————— — mc²
      √ 1 - v²/c²

The relativistic formula produces virtually the same amount as the classical formula unless the speed is very fast, i.e., a good fraction of the speed of light. Thermal energy, the energy due to a substance's temperature, is kinetic energy: on a microscopic scale, it is the energy of the movement of particles.


(physics,energy)
Further reading:
http://en.wikipedia.org/wiki/Kinetic_energy

Referenced by pages:
alpha particle
atmospheric escape
binding energy
Boltzmann constant (k)
Boltzmann equation
carbon (C)
CNO cycle
Compton scattering
core collapse
cosmic rays (CR)
dense core
dynamo
electron capture
endothermic reaction
entropy (S)
escape velocity (Ve)
electron volt (eV)
fusion
globular cluster (GC)
gravitational collapse
gravitationally bound
gravitational wave (GW)
GZK limit
Hamiltonian
hardness
ionizing radiation
Jeans length
Jeans parameter (λ)
Kelvin-Helmholtz mechanism
Kelvin-Helmholtz timescale (KH timescale)
Local Interstellar Cloud (LIC)
magnetic dipole braking
mass
Maxwell-Boltzmann distribution
neutron scattering
neutron spectrometer
oxygen burning
particle spectrometer
potential energy (PE)
pulsar (PSR)
magnetic reconnection
reheating
relativistic energy
relativistic momentum
solar energetic particle (SEP)
shock wave
superluminous supernova (SLSN)
solar wind
spin-down luminosity
temperature
tidal Q
VHE
virial parameter
virial theorem

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