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Work & Machines
Physical Science - Middle School
❮
1
/
2
❯
increases
force
increases
force
decreases
force
force
force
motion
motion
decreases
distance
decreases
distance
increases
distance
Work
is
the
exertion
of
force
on
an
object
that
causes
the
object
to
move
in
the
same
direction
in
which
the
force
is
applied.
If
the
object
does
not
move
as
a
result
of
the
force
applied,
no
work
is
done.
How
Much
Work?
Work
=
Force
x
Distance
Newton
(N)
is
the
unit
of
measure
for
force,
and
meter
(m)
is
the
basic
unit
for
distance.
Work
is
expressed
in
(N
•
m)
or
the
joule
(J).
Calculating
Power
Power
is
the
rate
at
which
work
is
done
or
the
rate
at
which
energy
is
transferred.
To
determine
the
amount
of
power
(P),
you
divide
the
amount
of
work
(W)
done
by
the
amount
of
time
(t)
it
takes
to
do
the
work.
Calculating
Work
To
determine
the
amount
of
work,
you
multiply
force
times
distance.
The
unit
of
measure
for
power
is
expressed
in
joules
per
second
(J/s)
also
known
as
the
Watt
(W).
Work
(W)
Time
(t)
Machines
1.
A
nutcracker
increases
the
force
but
decreases
the
distance
over
which
the
force
is
applied.
2.
A
hammer
decreases
the
force
but
increases
the
distance.
4.
A
simple
pulley
changes
the
direction
of
the
input
force,
but
the
amount
of
input
and
output
force
remain
the
same.
3.
A
screwdriver
used
as
a
lever,
increases
the
force
and
decreases
the
distance.
lever
inclined
plane
compound
machine
pulley
gears
wheel
& axle
wheel
& axle
Types
of
Machines
changes
direction
of
force
-
output
remains
the
same
Work
is
being
done.
No
work
is
done.
1.
2.
3.
4.
increases
force
increases
force
decreases
force
decreases
distance
decreases
distance
increases
distance
Machines
Simple
machines
are
devices
designed
to
make
work
easier
by
changing
the
amount
of
force
you
exert,
the
direction
of
the
force
or
the
distance
over
which
you
exert
the
force.
1.
A
nutcracker
increases
the
force
but
decreases
the
distance
over
which
the
force
is
applied.
2.
A
hammer
decreases
the
force
but
increases
the
distance.
3.
A
simple
pulley
changes
the
direction
of
the
input
force,
but
the
amount
of
input
and
output
force
remain
the
same.
4.
A
screwdriver
used
as
a
lever,
increases
the
force
and
decreases
the
distance.
changes
direction
of
force
-
output
remains
the
same
1.
2.
3.
4.
120
N
1
m
2
m
Work
=
120
N
x
1
m
=
120
N•m
Work
=
120
N
x
2
m
=
240
N•m
Increasing
the
distance
the
weights
are
lifted
also
increases
the
amount
of
work
done.
Meaning
of
Work
Power
(P)
=
Simple
machines
are
devices
designed
to
make
work
easier
by
changing
the
amount
of
force
you
exert,
the
direction
of
the
force
or
the
distance
over
which
you
exert
the
force.
© Copyright NewPath Learning. All Rights Reserved. 94-4801
www.newpathlearning.com
Work
& Machines
Work
(W)
Time
(t)
Power
(P)
=
force
motion
Meaning
of
Work
What
is
work?
_________________________
_____________________________________________________
_____________________________________________________
How
Much
Work?
Work
=
__________
x
__________
________________
is
the
unit
of
measure
for
force,
and
________________
is
the
basic
unit
for
distance.
Work
is
expressed
in
________________
or
the
________________
.
Calculating
Power
What
is
power?
_______________________________
_____________________________________________
To
determine
the
amount
of
power
(P),
you
divide
the
amount
of
________________
done
by
the
amount
of
________________
takes
to
do
the
work.
Calculating
Work
To
determine
the
amount
of
work,
you
multiply
________________
times
________________
.
The
unit
of
measure
for
power
is
expressed
in
________________
also
known
as
the
________________.
Machines
What
are
simple
machines?
_________________________________
_________________________________________________________
1.
A
nutcracker
________________
the
________________
but
________________
the
________________
over
which
the
force
is
applied.
2.
A
hammer
________________
the
________________
but
________________
the
________________
.
3.
A
screwdriver
used
as
a
________________
,
________________
the
________________
and
________________
the
________________
.
4.
A
simple
pulley
________________
the
________________
of
the
________________
________________
,
but
the
amount
of
________________
and
________________
________________
remain
the
________________
.
Types
of
Machines
Work
is
being
done.
1.
2.
3.
4.
120
N
1
m
2
m
Increasing
the
distance
the
weights
are
lifted
also
increases
the
amount
of
work
done.
Key
Vocabulary
Terms
•
force
•
power
•
joule
(j)
•
simple
machine
•
meter
(m)
•
Watt
(w)
•
Newton
(N)
•
work
© Copyright NewPath Learning.
All
Rights
Reserved.
94-4801
www.newpathlearning.com
Work
& Mach
ines
\|xiBAHBDy01808nzW
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