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Work & Machines
Science, Grade 3
❮
1
/
2
❯
Work
and
Machines
Inclined
Plane
Wheel
and
Axle
Screw
Wedge
Lever
Pulley
Bikes
move
by
using
wheels
and
axles,
too.
fixed
pulley
moveable
pulley
In
science,
work
is
when
you
use
force
upon
an
object
causing
the
object
to
move.
The
amount
of
work
you
do
depends
on
how
much
force
you
use
and
how
far
you
move
an
object.
You
do
more
work
lifting
up
a
heavy
desk
than
lifting
up
a
pencil.
If
you
do
not
move
an
object,
no
matter
how
hard
you
push
or
pull,
no
work
is
being
done.
In
order
for
work
to
be
done,
an
object
needs
to
move.
© Copyright NewPath Learning. All Rights Reserved. 94-4309
www.newpathlearning.com
Simple
machines
make
doing
work
easier
but
they
never
decrease
the
amount
of
work
that
needs
to
be
done.
There
are
many
different
kinds
of
simple
machines.
An
inclined
plane
is
a
simple
machine
that
is
a
plane
or
a
ramp
that
connects
a
higher
area
to
a
lower
area.
This
simple
machine
allows
you
to
move
an
object
up
or
down
by
rolling
or
sliding
it
without
lifting
the
object
directly.
A
wedge
is
a
simple
machine
made
of
wood
or
metal
that
has
a
pointed
edge
and
two
slanted
sides.
A
wedge
is
actually
two
inclined
planes
put
together.
A
wedge
is
often
used
to
split
wood,
to
cut
things,
or
to
hold
things
together.
A
screw
is
an
inclined
plane
that
is
wrapped
around
a
nail.
Screws
are
mainly
used
to
fasten
things
together
tightly.
A
lever
is
a
simple
machine
that
is
a
stiff
bar,
which
rests
and
moves
on
a
fixed
point.
You
can
push
down
on
one
side
to
raise
an
object
on
the
other
side.
A
see
saw
is
an
example
of
a
lever.
A
hammer
can
also
be
used
as
a
lever.
A
pulley
is
a
simple
machine
that
is
made
up
of
a
wheel
with
a
grooved
rim
in
which
a
rope
can
move
around
in
order
to
help
lift
a
load.
When
you
use
a
pulley
you
can
use
your
own
body
weight
to
help
raise
an
object
by
pulling
the
object
up.
There
are
two
kinds
of
pulleys.
A
movable
pulley
is
attached
to
the
load
and
moves
with
the
load
as
the
rope
is
pulled.
A
fixed
pulley
is
attached
to
a
non-moving
structure
above
the
load.
A
wheel
and
axle
is
a
simple
machine
made
up
of
a
pole
and
a
wheel
that
revolves
or
turns
around
on
the
pole.
A
door
knob
is
an
example
of
a
wheel
and
axle.
inclined
plane
Forces
-
How
Simple
Machines
Work
input
force
output
force
input
force
output
force
output
force
output
force
input
force
input
force
output
force
Work
and
Machines
Inclined
Plane
Wheel
and
Axle
Screw
Wedge
Bikes
move
by
using
wheels
and
axles,
too.
How
do
scientists
define
work?
___________________________________________________________
___________________________________________________________
___________________________________________________________
What
do
simple
machines
allow
you
to
do?
___________________________________________________________
___________________________________________________________
Forces
-
How
Simple
Machines
Work
input
force
output
force
input
force
output
force
output
force
output
force
input
force
input
force
output
force
Describe
an
inclined
plane:
________________________________
________________________________
________________________________
Describe
a
screw:
________________________
________________________
________________________
Describe
a
wheel
and
axle:
_______________
_______________
_______________
_______________
Describe
a
wedge:
________________________________
________________________________
_________________________
Key
Vocabulary
Terms
fixed
pulley
force
inclined
plane
lever
movable
pulley
pulley
screw
simple
machines
wedge
wheel
and
axle
work
Lever
Describe
a
lever:
_____________________________
_____________________________
_____________________
_____________________
Pulley
Describe
a
pulley:
____________
_____________________
_____________________
How
is
a
movable
pulley
different
from
a
fixed
pulley?
_____________________________
_____________________________
© Copyright NewPath Learning. All Rights Reserved. 94-4309
www.newpathlearning.com
\|xiBAHBDy01740qzZ
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