Transcript A roller coaster climbs up a hill at 4 m/s and then zips down the hill

Momentum and Collisions
Review
A roller coaster climbs up a hill at 4 m/s and
then zips down the hill at 30 m/s. The
momentum of the roller coaster
1. is greater up the hill
than down the hill.
2. is greater down the
hill than up the hill.
3. remains the same
throughout the ride.
4. is zero throughout the
ride.
is
...
th
ro
ug
h
ze
ro
th
e
m
ai
ns
re
ou
tt
he
th
...
e
sa
m
n
do
w
te
r
gr
ea
is
is
gr
ea
te
r
up
th
e
hi
ll
th
e
hi
th
..
l..
.
0% 0% 0% 0%
A force is applied to stop a moving shopping
cart. Increasing the time interval over which
the force is applied
1. requires a greater
force.
2. has no effect on the
force needed.
3. requires a smaller
force.
4. requires the same
force.
.
fo
rc
e
fo
rc
e
th
e
sa
m
e
le
r
sm
al
a
re
qu
i
re
s
re
s
qu
i
re
no
s
ha
re
qu
i
re
s
ef
a
fe
c
to
gr
ea
n
te
r
th
e
f..
.
fo
rc
e
.
.
0% 0% 0% 0%
When the total initial momentum
before a collision is zero, which
of the following cannot be true?
0%
he
ab
ov
sa
re
es
ta
t
m
ov
i
em
ng
e.
..
..
0%
of
t
Bo
th
to
t
ob
je
ct
en
tu
m
o.
..
m
al
m
om
bo
th
re
Th
e
ob
je
ct
sa
Th
e
0%
af
t..
0%
Al
l
1. The objects are both moving
in opposite directions.
2. The total momentum after the
collision will be zero.
3. Both objects are moving in the
same direction before the
collision.
4. All of the above statements
are true
A moderate force will break an egg. However, an
egg dropped on the road usually breaks, while one
dropped on the grass usually does not break
because for the egg dropped on the grass,
...
lf
rv
a
in
te
tim
e
e
th
e
th
or
s
...
lf
rv
a
in
te
tim
e
ch
an
e
th
or
s
m
om
...
in
ge
in
m
om
...
0% 0% 0% 0%
ge
4.
ch
an
3.
e
2.
the change in momentum
is greater.
the change in momentum
is less.
the time interval for
stopping is greater.
the time interval for
stopping is less.
th
1.
A large moving ball collides with a
small stationary ball. The momentum
..
e.
ng
e
ha
tc
rg
e
do
es
no
la
th
e
of
fo
r
ll
in
c
ba
in
cr
lls
ba
th
bo
of
r..
.
e.
ea
s
.
ec
r ..
ll
d
ba
rg
e
la
4.
0% 0% 0% 0%
th
e
2.
3.
of the large ball
decreases, and the
momentum of the small
ball increases.
of both balls increase.
of the large ball
increases, and the
momentum of the small
ball decreases.
does not change for
either ball.
of
1.
In a two-body collision in a
closed system,
is
al
er
w
...
m
om
en
bo
tu
th
m
m
no
om
...
en
tu
m
an
d
...
ith
ne
en
ne
tic
ki
om
en
tu
m
is
er
gy
al
w
ay
s
...
0% 0% 0% 0%
m
1. momentum is always
conserved.
2. kinetic energy is always
conserved.
3. neither momentum nor
kinetic energy is
conserved.
4. both momentum and
kinetic energy are
conserved.
The impulse experienced by a body
is equivalent to its change in:
velocity.
kinetic energy.
momentum.
None of the above
choices are valid.
e
c.
..
.
en
tu
m
om
th
e
m
ab
ov
.
er
gy
N
on
e
of
ki
ne
tic
en
lo
ci
ty
.
0% 0% 0% 0%
ve
1.
2.
3.
4.
A valid unit for momentum is
which of the following?
kg×m/s2
kg/m2
kg×m/s
N×m
×m
0%
N
×m
/s
0%
kg
/m
2
0%
kg
×m
/s
2
0%
kg
1.
2.
3.
4.
The units of impulse are
equivalent to:
those of energy.
N×m.
kg×m/s.
those of force.
0%
.
fo
rc
e
os
e
of
kg
×m
.
×m
N
0%
/s
.
0%
th
os
e
of
en
er
gy
.
0%
th
1.
2.
3.
4.
If the momentum of an object is tripled, its
kinetic energy will change by what factor?
zero
one-third
three
nine
ne
0%
ni
re
e
0%
th
eth
i
rd
0%
on
ro
0%
ze
1.
2.
3.
4.
After analyzing a collision, you
find that the kinetic energy was
conserved. You can assume the
collision was:
0%
0%
de
te
rm
be
to
bl
e
Un
a
0%
in
ed
st
ic
el
a
in
ha
t
ew
So
m
Pe
rfe
ct
ly
in
el
a
el
a
st
ic
st
ic
0%
Pe
rfe
ct
ly
1. Perfectly elastic
2. Perfectly inelastic
3. Somewhat
inelastic
4. Unable to be
determined
After analyzing a collision, you
find that the momentum was
conserved. You can assume the
collision was:
0%
0%
de
te
rm
be
to
bl
e
Un
a
0%
in
ed
st
ic
el
a
in
ha
t
ew
So
m
Pe
rfe
ct
ly
in
el
a
el
a
st
ic
st
ic
0%
Pe
rfe
ct
ly
1. Perfectly elastic
2. Perfectly inelastic
3. Somewhat
inelastic
4. Unable to be
determined