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1AL
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English
Date
Jan 9, 2024
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1AL
Lab
5
Conclusion
:
Testing
a
Model
for
Friction
Conceptual
[3.0
pts]:
Q1.[1.5
p?s]
A
studgnt
'ap'plie.s
a
1.5-N
horizontal
force
on
a
box
of
weight
20
N
on
a
floor.
The
coefficient
of
static
friction
is
0.3.
Does
the
box
move?
Explain
your
reasoning
&
show
your
work.
Q2.
.
[0.5
pts]
What
is
the
primary
difference
between
a
situation
where
kinetic
friction
applies
3
between
two
objects
and
one
where
static
friction
applies?
ii.
[0.5
pts]
How
does
the
friction
force
scale
with
the
applied
force
in
each
of
the
two
scenarios?
(Assume
the
applied
force
is
parallel
to
the
interface
between
the
two
objects)?
:
iii.
[0.5
pts]
For
the
interface
between
two
particular
objects,
how
does
the
magnitude
of
the
force
of
kinetic
friction
compare
to
the
magnitude
of
maximum
force
of
static
friction?
Data
Analysis
[7.0
pts]:
Q3.
This
question
and
the
next
refer
to
steps
in
Part
B
of
the
lab
manual.
i.
[0.25
pts]
Report
the
angle
of
the
track
with
uncertainty
from
Step
B1.
ii.
[0.75
pts]
Report
your
multiple
measurements
of
the
time
(Step
B2)
including
the
uncertainty
of
each
measurement.
Calculate
the
average
of
your
measurements
and
its
uncertainty,
and
find
the
acceleration
of
the
cart
and
its
uncertainty
using
the
average
time.
Q4.
i.[1.5
pts]
Derive
an
expression
for
the
coefficient
of
kinetic
friction
[as
per
Step
BS],
then
use
your
results
from
Q3
to
calculate
the
coefficient
of
kinetic
friction
and
its
uncertainty.
Make
sure
to
include
and
propagate
all
sources
of
uncertainty.
ii.
[0.5
pts]
How
would
the
force
of
kinetic
friction
change
if
you
increase
the
angle
of
the
track?
Explain
your
reasoning.
Q5.
This
question
and
the
next
refer
to
steps
in
Part
C
of
the
lab
manual.
i.
[1.5
pts]
Report
Part
C
measurements
in
the
following
table
(F1
and
F2
are
maximum
static
friction
from
trials
1
and
2).
Add
more
columns
if
you
have
more
than
two
trials.
trial
1
trial
2
average:
uncertainty:
F1
F2
(F1+F2)/2
(F1-F2)/2
Control
Contact
area
Normal
force
Material
ii.
[0.5
pts)
Comparing
your
uncertainties
in
the
table
to
the
precision
of
the
force
sensor
that
you
.
measured
in
Part
C,
does
the
latter
explain
the
uncertainty
in
the
measurements?
What
does
it
imply
about
the
sources
of
uncertainty?
Q6.
i.[1.0
pts]
What
do
your
data
in
Step
C2
say
about
static
frictionial
force's
dependence
on
surface
area,
normal
force,
and
material?
Remember
to
consider
uncertf'amty.
ii.
[1.0
pts]
What
does
the
textbook
say
about
each
of
}hese
factors?
Explaln
where
the
discrepancy
between
your
data
and
the
textbook
might
come
from
if
you
have
any.
Submission
Requirements
i
i
first
data
page,
with
your
ned
data,
with
the
names
of
your
lab
partners
on
your
£
:::Umtfses?'::
:
:g
sure
to
tag the
page
for
each
question
when
submitting
to
Gradescope.
These
are
required
to
receive
credit
for
your
submission.
‘h.r_:_gh
s
T
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