2. Gravity
• Earth’s
gravity
pulls
objects
toward
the
center
of
the
Earth
and
gives
them
weight.
• Weight
is
a
force
measured
in
Newtons
(N).
3. Newtons
• Newtons
are
named
a@er
Sir
Isaac
Newton.
• On
Earth
every
kilogram
of
mass
is
pulled
down
by
gravity
with
a
force
of
10
N.
4. Gravity
• Other
planets
also
have
gravity
but
the
size
of
the
gravity
may
be
different
from
the
Earth.
• Objects
weigh
more
where
the
gravity
is
bigger.
5. Gravity
• Gravity
is
an
invisible
force.
It
holds
you
onto
the
Earth.
• It
speeds
you
up
when
you
cycle
downhill
• It
pulls
you
back
when
you
cycle
uphill
6. Gravity
• It
makes
everything
fall
to
the
ground
• It
holds
the
Moon
in
its
orbit
around
the
Earth,
and
the
Earth
in
orbit
around
the
Sun.
• You
cannot
see
it,
but
you
can
observe
its
effects
7. Gravity
• Gravity
is
a
pulling
force.
It
never
pushes.
• The
pull
is
always
in
a
straight
line
towards
the
center
of
the
Earth.
8.
9. Mass
• Like
all
objects
you
have
mass.
• Mass
tells
you
how
much
material
is
in
your
body.
• Mass
is
measured
in
grams
(g)
or
in
kilograms
(kg).
10. Weight
• Mass
is
o@en
confused
with
weight.
• Weight
tells
you
how
strong
the
force
of
gravity
is
pulling
on
your
mass.
• Weight
is
a
force
and
is
measured
in
Newtons
(N).
11. Mass
&
Weight
• What
happens
to
your
mass
and
weight
on
the
moon?
• The
mass
of
an
object
NEVER
changes
no
maRer
where
you
take
it.
12. Mass
&
Weight
• If
your
mass
on
Earth
was
50
kg,
your
mass
on
the
moon
would
remain
the
same
at
50kg.
This
is
because
you
are
sTll
made
of
the
same
about
of
material.
• Your
weight
on
the
moon
would
be
different,
because
the
force
of
gravity
on
the
moon
is
different.
13. Weight
• Given
the
force
of
gravity
is
one-‐sixth
of
that
of
the
earth,
your
weight
would
be:
• 500
N
divided
by
6
=
83.3
N
14.
15.
16.
17.
18. • Explain
what
gravity
is.
• Explain
in
your
own
words
the
difference
between
mass
and
weight.
• Jupiter
has
a
gravity
pull
which
is
2.5
Tmes
greater
than
on
Earth.
Mr
Stace’s
mass
is
80
kg.
What
is
his
mass
and
weight
on
the
surface
of
Jupiter.
