### kinetic energy

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

**Kinetic energy** is the energy an object has inherent in
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** (aka **heat energy**), the energy due to a substance's temperature,
is the collective kinetic energy of all the particles' individual
movements. Sometimes this is assumed, such as stating that energy
is converted to "kinetic energy" when it heats something.
But other times the terms are treated as if thermal energy is
not the same, e.g., statements such as "friction converts kinetic
energy to thermal energy"; this latter can be treated as a less-formal
usage of the phrase kinetic energy to mean "non-thermal kinetic
energy".

(*physics,energy*)
**Further reading:**

https://en.wikipedia.org/wiki/Kinetic_energy

**Referenced by pages:**

alpha particle

atmospheric escape

binding energy

Boltzmann constant (k)

Boltzmann equation

carbon (C)

cosmic neutrino background (CNB)

CNO cycle

Compton scattering

core collapse

cosmic rays (CR)

cyclotron emission radiation spectroscopy (CRES)

dense core

dynamo

electron capture

endothermic reaction

entropy (S)

escape velocity (V_{e})

electron volt (eV)

fusion

globular cluster (GC)

gravitational collapse

gravitational potential energy

gravitationally bound

gravitational wave (GW)

GZK limit

Hamiltonian

hardness

hydrodynamic escape

ionizing radiation

Jeans length

Jeans parameter (λ)

KATRIN

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)

power law

Project 8

pulsar (PSR)

magnetic reconnection

reheating

relativistic energy

relativistic momentum

solar energetic particle (SEP)

shock wave

superluminous supernova (SLSN)

solar neutrino

solar wind

spectroscopy

spin-down luminosity

temperature

tidal Q

VHE

very-high-energy gamma rays (VHEGR)

virial parameter

virial theorem

Wigner crystal

Index