Download Rotational Motion Review

Rotational Motion Review
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Consider a point on a bicycle tire that is
momentarily in contact with the ground as the
bicycle rolls across the ground with constant
speed. The direction for the centripetal
acceleration for this point at that moment is:
1. upward.
2. down toward the
ground.
0% 0% 0% 0%
3. forward.
4. at that moment the
acceleration is zero.
A roller coaster has two loops of different radii.
Which will have the greater centripetal force?
0%
io
n
e
in
fo
rm
at
sa
m
en
ou
gh
bo
th
ha
v
et
he
le
rr
sm
al
ith
w
lo
op
0%
ad
iu
iu
s
gr
ea
te
rr
ad
ith
w
lo
op
0%
s
0%
no
t
1. loop with greater
radius
2. loop with smaller
radius
3. both have the same
4. not enough
information
The Gemini roller coaster has two cars of
differing mass. Which will have a greater
centripetal force at the bottom of the first hill?
0%
io
n
e
at
in
fo
rm
en
ou
gh
Bo
th
ha
ve
th
e
sa
le
ss
m
it h
w
Ca
r
0%
m
as
as
s
m
or
e
m
it h
w
0%
s
0%
no
t
Car with more mass
Car with less mass
Both have the same
not enough
information
Ca
r
1.
2.
3.
4.
A roller coaster has two loops of different radii.
What forces provide the centripetal force at the
top of the loop?
0%
0%
0%
0%
0%
m
al
fo
ta
rc
m
t
e
al
io
Fo
na
rc
lf
No
e
or
rm
+
ce
Gr
al
a
Fo
vi
ta
Gr
rc
t..
e
av
-G
.
ita
ra
t io
vi
na
ta
lF
t..
.
or
ce
–
N.
Fr
..
ict
io
na
lF
or
ce
0%
No
r
Gr
av
i
No
r
1. Normal force
2. Gravitational force
3. Normal Force +
Gravitational Force
4. Normal Force Gravitational Force
5. Gravitational Force –
Normal Force
6. Frictional Force
In a looped roller coaster, what force(s) provide
the centripetal force at the top of the loop at
the minimum speed needed to get over the
loop?
0%
0%
0%
0%
0%
m
al
fo
rc
e
Gr
o.
..
av
ita
t io
na
No
l.
rm
..
al
Fo
rc
e
No
+.
rm
..
al
Fo
rc
e
Gr
-..
av
.
ita
t io
na
l.
Fr
..
ict
io
na
lF
or
.. .
0%
No
r
1. Normal force only
2. Gravitational force only
3. Normal Force +
Gravitational Force
4. Normal Force Gravitational Force
5. Gravitational Force –
Normal Force
6. Frictional Force
A roller coaster has two loops of different radii.
What forces provide the centripetal force at the
bottom of the loop?
0%
0%
0%
0%
0%
m
al
fo
ta
rc
m
t
e
al
io
Fo
na
rc
lf
No
e
or
rm
+
ce
Gr
al
a
Fo
vi
ta
Gr
rc
t..
e
av
-G
.
ita
ra
t io
vi
na
ta
lF
t..
.
or
ce
–
N.
Fr
..
ict
io
na
lF
or
ce
0%
No
r
Gr
av
i
No
r
1. Normal force
2. Gravitational force
3. Normal Force +
Gravitational Force
4. Normal Force Gravitational Force
5. Gravitational Force –
Normal Force
6. Frictional Force
A roller coaster has two loops of different radii.
What forces provide the centripetal force
directly to the left of the loop?
0%
0%
0%
0%
0%
m
al
fo
ta
rc
m
t
e
al
io
Fo
na
rc
lf
No
e
or
rm
+
ce
Gr
al
a
Fo
vi
ta
Gr
rc
t..
e
av
-G
.
ita
ra
t io
vi
na
ta
lF
t..
.
or
ce
–
N.
Fr
..
ict
io
na
lF
or
ce
0%
No
r
Gr
av
i
No
r
1. Normal force
2. Gravitational force
3. Normal Force +
Gravitational Force
4. Normal Force Gravitational Force
5. Gravitational Force –
Normal Force
6. Frictional Force
What gives the centripetal force that
allows a motorcycle to drive around
the inside of a cage?
0%
Ap
pl
ie
d
l
0%
Te
ns
io
na
m
l
io
na
ta
t
Gr
av
i
0%
al
0%
l
0%
No
r
Frictional
Gravitational
Normal
Tensional
Applied
Fr
ict
io
na
1.
2.
3.
4.
5.
What gives the centripetal force that
keeps the moon revolving around the
Earth?
0%
Ap
pl
ie
d
l
0%
Te
ns
io
na
m
l
io
na
ta
t
Gr
av
i
0%
al
0%
l
0%
No
r
Frictional
Gravitational
Normal
Tensional
Applied
Fr
ict
io
na
1.
2.
3.
4.
5.
Two adjacent lanes are curving. If the lanes are
flat, what provides the centripetal force?
Normal force
.
0%
or
..
lF
ce
al
Fo
r
m
Fr
ict
io
na
..
vi
ta
t
io
n
al.
fo
rc
al
No
rm
0%
+.
..
0%
e
0%
No
r
2. Gravitational force
3. Normal Force +
Gravitational Force
4. Frictional Force
Gr
a
1.
Two adjacent lanes are curving. Which lane
should you choose if you want to minimize the
centripetal force?
ef
or
am
be
es
un
a
bl
e
to
ha
v
bo
th
0%
de
te
rm
in
ed
0%
ce
an
e
0%
ou
te
rl
an
e
0%
in
ne
rl
1. inner lane
2. outer lane
3. both have same
force
4. unable to be
determined
A lane on the highway is curving and you feel
forced towards the outside of the curve as you
drive. The most direct cause of this is:
Normal force
ta
t
vi
Gr
a
0%
0%
fo
.. .
Ce
nt
r ip
et
al
fo
.. .
..
al.
fo
rc
al
No
rm
0%
Ce
nt
r if
ug
al
0%
e
0%
In
er
t ia
2. Gravitational force
3. Inertia
4. Centrifugal force
5. Centripetal force
io
n
1.
How is gravitational force proportional
to the distance between two objects?
1. Directly
2. Inversely
3. No Correlation
0%
0%
No
Co
rre
la
tio
n
In
ve
rs
el
y
Di
re
ct
ly
0%
How is gravitational force proportional
to the mass of two objects?
1. Directly
2. Inversely
3. No Correlation
0%
0%
No
Co
rre
la
tio
n
In
ve
rs
el
y
Di
re
ct
ly
0%
How is gravitational force proportional
to the volume of two objects?
1. Directly
2. Inversely
3. No Correlation
0%
0%
No
Co
rre
la
tio
n
In
ve
rs
el
y
Di
re
ct
ly
0%
On vacation, you go to the Grand Canyon and
walk down to the bottom of the canyon. During
this walk what happened to your weight?
at
io
n
0%
in
fo
rm
No
ch
an
ge
0%
en
ou
gh
W
ei
g
ht
d
re
as
nc
ht
i
0%
ec
re
as
ed
ed
0%
No
t
Weight increased
Weight decreased
No change
Not enough
information
W
ei
g
1.
2.
3.
4.
Be
¼
yo
ur
w
ei
g
Be
ht
sa
m
e
Th
e
cu
on
ti
n
Ea
r
ha
l
th
f
Do
ub
le
You travel to another planet that has twice the
radius of the Earth but the same mass.
Compared to your weight on Earth, your weight
will
1. Double
2. Be cut in half
3. Be ¼ your weight on
Earth
0% 0% 0% 0%
4. The same
Which will produce the most torque?
ex
er
te
d
.3
m
.0
1m
0%
fr.
.
...
0%
fo
rc
e
fo
rc
e
ex
er
t
ed
20
N
ex
er
t
fo
rc
e
10
N
ed
.2
m
.2
m
d
ex
er
te
fo
rc
e
5N
0%
f..
.
fr.
.
0%
5N
1. 5N force exerted
.2m from the axis
2. 10N force exerted
.2m from the axis
3. 20N force exerted
.01m from the axis
4. 5N force exerted
.3m from the axis
What is a way to increase the torque
on an object?
0%
0%
0%
0%
ea
es
ta
se
.. .
rf
or
Bo
ce
th
c lo
1
an
se
d
...
2
ar
ec
or
re
Al
ct
lo
ft
he
ab
ov
e
fo
rc
Ex
er
t
al
sa
m
e
th
e
Ex
er
t
m
or
e
fo
rc
e.
0%
Ex
er
t
1. Exert more force.
2. Exert the same force
at a greater distance
from the fulcrum.
3. Exert a lesser force
closer to the
fulcrum.
4. Both 1 and 2 are
correct
5. All of the above
Which of the following produces
positive torque on a lever?
1. A parallel force 20cm from the
axis
2. A perpendicular force upward
20cm to the right of the axis
3. A perpendicular force upward
20cm to the left of the axis
4. A perpendicular force downward
20cm to the right of the axis
cu
la
A
pe
rp
en
di
cu
la
A
pe
rp
en
di
cu
la
.. .
0%
.. .
0%
.. .
0%
pe
rp
en
di
A
A
pa
ra
lle
lf
or
...
0%
The average position of an object’s
weight is the
Fulcrum
Center of mass
Gravitational Force
Lever
Axis of rotation
0%
.
0%
ti.
.
ot
a
so
fr
Ax
i
0%
Le
ve
r
0%
um
Ce
nt
er
of
m
as
s
Gr
av
ita
t io
na
l.
..
0%
Fu
lcr
1.
2.
3.
4.
5.
An object in rotational equilibrium has
1. No torque applied
2. A constant
tangential speed
3. A net torque of zero
4. An axis of rotation
ot
...
0%
so
fr
ax
i
An
ne
tt
or
A
nt
t
co
ns
ta
A
qu
e
an
. ..
pl
..
ap
rq
ue
to
No
0%
o.
..
0%
.
0%