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In
the
language
of
physics
a
field
is
a
space
where
objects
experience
a
force.
The
field
can
be
represented
by
lines
showing
the
direction
of
the
force
the
object
experiences
in
the
field.
Gravitational
Field
Reset
Show
field
lines
Drag
the
man
along
the
ground
to
a
different
position.
Now
click
the
ball.
The
gravitational
field
will
do
work
on
the
ball
causing
it
to
accelerate
along
the
gravitational
field
lines.
Fields
Factus
est
XII,
MMXIX
In
the
language
of
physics
a
field
is
a
space
where
objects
experience
a
force.
The
field
can
be
represented
by
lines
showing
the
direction
of
the
force
the
object
experiences
in
the
field.
The
closer
the
lines
are
together
the
stronger
the
force
experienced
by
the
object.
Gravitational
Field
Reset
Show
Gravitational
field
lines
Viewed
from
outer
space
the
Earth’s
gravitational
field
is
radial
and
points
towards
the
centre
of
the
Earth.
This
means
masses
will
experience
a
force
towards
the
centre
of
the
earth.
Play
Fields
Factus
est
XII,
MMXIX
Electric
Fields
Electric
charges
such
as
protons
and
electrons
experience
forces
of
attraction
and
repulsion.
This
means
that
around
a
charged
particle
there
must
exist
and
Electric
Field.
+
The
electric
field
around
a
positive
charge
is
radial,
just
like
the
spokes
of
a
bicycle
wheel.
The
arrows
show
the
direction
of
the
electric
field
experienced
by
a
very
small
positive
charge
and
thus
the
direction
of
the
force
experienced
by
the
small
positive
charge.
Play
Reset
Notice
that
the
small
negative
charges
move
in
the
opposite
direction
to
the
Electric
field
arrows.
negative
charge
positive
charge
Fields
Factus
est
XII,
MMXIX
When
a
positive
charge
is
moved
against
the
electric
field
lines
work
has
to
be
done
on
the
electric
charge.
This
is
similar
to
lifting
up
a
mass
against
a
gravitational
field.
Let
the
mass
go
and
it
accelerates
to
the
ground.
The
gravitational
field
does
work
on
the
mass.
The
work
done
on
the
positive
charge
moving
it
against
the
electric
field
is
transferred
into
electrical
potential
energy.
When
released
this
electrical
potential
energy
is
transferred
to
kinetic
energy.
Work
done
in
moving
an
electric
charge
+
+
+
+
+
+
-
-
-
-
-
-
Work
being
done
on
the
electric
charge
as
it
is
moved
against
the
electric
field.
Work
done
on
charge
by
electric
field
+
If
it
takes
1
joule
to
move
1
coulomb
of
electric
charge
from
one
plate
to
the
other,
it
is
said
the
the
electrical
potential
difference
between
the
plates
is
1
volt.
V
=
W
Q
Definition
of
the
volt
Fields
Factus
est
XII,
MMXIX