Physics
-
Unit
7
Progress
Check:
MCQ
Part
A
+
B
A
group
of
students
must
conduct
an
experiment
to
determine
how
the
location
of
an
applied
force
on
a
classroom
door
affects
the
rotational
motion
of
the
door.
The
rotational
inertia
of
the
door
about
its
hinges
is
known.
The
initial
angular
velocity
of
the
door
is
zero.
Which
of
the
following
lists
what
measuring
devices
the
students
need
and
the
measurements
they
should
take
to
collect
the
necessary
data
to
test
the
relationship
between
a
torque
exerted
on
the
door
and
the
change
in
angular
velocity
of
that
object
about
the
hinges
of
the
door?
Justify
your
selection.
A)
A
protractor
to
measure
the
angular
displacement
of
the
door
and
a
meterstick
to
measure
the
radial
distance
from
the
door's
hinges
to
the
location
where
the
force
is
applied.
B)
A
stopwatch
to
measure
the
time
interval
during
which
the
force
is
applied
and
a
meterstick
to
measure
the
radial
distance
from
the
door's
hinges
to
the
location
where
the
-
ANS
D)
A
stopwatch
to
measure
the
time
interval
during
which
the
force
is
applied,
a
force
probe
to
measure
the
applied
force
on
the
door,
a
protractor
to
measure
the
angular
displacement
of
the
door,
and
a
meterstick
to
measure
the
radial
distance
from
the
door's
hinges
to
the
location
where
the
force
is
applied.
A
group
of
students
must
conduct
an
experiment
to
determine
how
the
location
of
an
applied
force
on
a
classroom
door
affects
the
rotational
motion
of
the
door.
The
rotational
inertia
of
the
door
about
its
hinges
is
known.
The
initial
angular
velocity
of
the
door
is
zero.
The
students
must
determine
how
to
test
the
relationship
between
a
torque
exerted
on
the
door
and
the
change
in
the
angular
velocity
of
the
door.
All
frictional
forces
are
considered
to
be
negligible.
How
should
the
experiment
be
conducted
to
test
the
relationship
between
the
torque exerted
on
the
door
and
the
change
in
the
door's
angular
velocity
in
a
way
that
minimizes
experimental
uncertainty?
A)
The
students
should
perform
several
trials,
applying
the
same
force
at
the
same
vertical
distance
from
the
floor.
B)
The
students
should
perform
several
trials,
applying
the
same
force
at
different
vertical
distances
from
the
floor.
C)
The
students
shoul
-
ANS
D)
The
students
should
perform
several
trials,
applying
the
same
force
at
different
horizontal
distances
from
the
hinges.
A
group
of
students
must
conduct
an
experiment
to
determine
how
the
location
of
an
applied
force
on
a
classroom
door
affects
the
rotational
motion
of
the
door.
The
rotational
inertia
of
the
door
about
its
hinges
is
known.
The
initial
angular
velocity
of
the
door
is
zero.
The
students
conduct
the
experiment
and
gather
data
about
the
net
torque
exerted
on
the
door
and
angular
acceleration
of
the
door
for
several
trials.
They
create
a
graph
of
the
door's
angular
acceleration
as
a
function
of
the
net
torque
and
sketch
a
best-fit
line
through
the
data.
How
can
the
students
analyze
the
data
to
determine
the
rotational
inertia
of
the
door
about
its
hinges?
A)
Determine
the
slope
of
the
best-fit
line.
B)
Determine
the
inverse
of
the
slope
of
the
best-fit
line.
C)
Determine
the
horizontal
intercept
of
the
best-fit
line.
D)
Determine
the
vertical
intercept
of
the
best-fit
line.
-
ANS
B)
Determine
the
inverse
of
the
slope
of
the
best-fit
line.
A
point
on
the
edge
of
a
disk
rotates
around
the
center
of
the
disk
with
an
initial
angular
velocity
of
3rad/s
clockwise.
The
graph
shows
the
point's
angular
acceleration
as
a
function
of
time.
The
positive
direction
is
considered
to
be
counterclockwise.
All
frictional
forces
are
considered
to
be
negligible.
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