Definition of Vis viva
(Mech.)
living
force
;
the
force
of
a
body
moving
against
resistance
,
or
doing
work
,
in
distinction
from
vis mortua
,
or
dead
force
;
the
kinetic
energy
of
a
moving
body
;
the
capacity
of
a
moving
body
to
do
work
by
reason
of
its
being
in
motion
.
See
Kinetic
energy
,
in
the
Note
under
Energy
.
The
term
vis viva
is
not
usually
understood
to
include
that
part
of
the
kinetic
energy
of
the
body
which
is
due
to
the
vibrations
of
its
molecules
.
See also:
Vis
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