29
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Force
A
push
or
pull
that
affect
an
object
to
change in
motion
or
shape
is
considered as
a
force. In
addition, based
on
Sir
Isaac Newton’s
study,
the
characteristics
of
force
can
be
described
as
follows
as
stated
in
Newton
three laws of motion [11]:
1. Every object in a state of uniform motion tends to remain in that
state of motion unless an external force is applied to it.
2. The relationship between an object's mass m, its acceleration a, and
the applied force F is F = ma. Acceleration and force are vectors
(as indicated by their symbols being displayed in slant bold
font);
in
this
law the direction of the
force vector
is the same as the direction
of the acceleration vector.
3. For every action there is an equal and opposite reaction.
Using these
descriptions,
it
is possible
to calculate
the
required
force,
which
works
as
a
thrust,
for
an
object
to
move
based on
its
mass
and
acceleration.
Aside
from
movement,
it
can
also
be
utilized
as
a
factor
to
control an object
to behave
properly as
in
factual
world,
such
as
a
car that
move
on
a
road
will
not
keep
on
moving, because there
is
an
opposite
frictional
force from
the road exist that enable it to stop, when the net force
of these opposite forces is equal to zero.
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