The figure below shows the unusual path of a confused
football player. After receiving a kickoff at his own goal, he runs
downfield to within inches of a touchdown, then reverses
direction and races back until he’s tackled at the exact location
where he first caught the ball. During this run, which took 25 s,
what is the path length he travels? 25%
25%
25%
25%
1.
2.
3.
4.
100 yd
200 yd
0.00 yd
It is more than 100 yd, but you
must know the exact path to
say exactly.
1
2
3
4
The figure below shows the unusual path of a confused
football player. After receiving a kickoff at his own goal, he runs
downfield to within inches of a touchdown, then reverses
direction and races back until he’s tackled at the exact location
where he first caught the ball. During this run, which took 25 s,
25%
25%
25%
25%
what is his displacement?
1.
2.
3.
4.
100 yd
200 yd
0.00 yd
It is more than 100 yd, but you
must know the exact path to
say exactly.
1
2
3
4
The figure below shows the unusual path of a confused
football player. After receiving a kickoff at his own goal, he
runs downfield to within inches of a touchdown, then reverses
direction and races back until he’s tackled at the exact
location where he first caught the ball. During this run, which
took 25 s, what is his average velocity in the x-direction?
25%
1.
2.
3.
4.
100 yd
200 yd
0.00 yd
It is more than 100 yd, but you
must know the exact path to
say exactly.
1
25%
25%
2
3
25%
4
The figure below shows the unusual path of a confused
football player. After receiving a kickoff at his own goal, he
runs downfield to within inches of a touchdown, then reverses
direction and races back until he’s tackled at the exact
location where he first caught the ball. During this run, which
took 25 s, what is his average speed?
25%
1.
2.
3.
4.
100 yd/s
25.0 yd/s
8.00 yd/s
0.00 yd/s
1
25%
25%
2
3
25%
4
True or False? A car must always have an
acceleration in the same direction as its
velocity.
50%
50%
1. False
2. True
1
2
True or False? It’s possible for a slowing
car to have a positive acceleration.
50%
50%
1. False
2. True
1
2
True or False? An object with constant
nonzero acceleration can never stop and
remain at rest.
50%
50%
1. False
2. True
1
2
Parts (a), (b), and (c) of the figure below represent three graphs of the
velocities of different objects moving in straight-line paths as functions
of time. The possible accelerations of each object as functions of time
are shown in parts (d), (e), and (f). Match each velocity vs. time graph
with the acceleration vs. time graph that best describes the motion.
33%
1. a and e, b and f, c and d
2. a and d, b and f, c and e
3. a and e, b and d, c and f
1
33%
2
33%
3
The three graphs in the figures below represent the
position vs. time for objects moving along the x-axis.
Which, if any, of these graphs is not physically possible?
25%
25%
25%
2
3
25%
1. Graph a is impossible.
2. Graph b is impossible.
3. Graph c is impossible.
4. All three are possible.
1
4
This figure is a diagram of a multiflash image of
an air puck moving to the right on a horizontal
surface. The images sketched are separated by
equal time intervals, and the first and last
images show the puck at rest. In figure b, which
color graph best shows the puck’s position as a
function of time?
33%
1.
2.
3.
red
green
blue
1
33%
2
33%
3
This figure is a diagram of a multiflash image of
an air puck moving to the right on a horizontal
surface. The images sketched are separated by
equal time intervals, and the first and last
images show the puck at rest. In figure c, which
color graph best shows the puck’s velocity as a
function of time?
33%
1.
2.
3.
red
green
blue
1
33%
2
33%
3
This figure is a diagram of a multiflash image of
an air puck moving to the right on a horizontal
surface. The images sketched are separated by
equal time intervals, and the first and last images
show the puck at rest. In figure d, which color
graph best shows the puck’s acceleration as a
function of time?
33%
1.
2.
3.
red
green
blue
1
33%
2
33%
3
A tennis player on serve tosses a ball
straight up. While the ball is in free fall, its
acceleration
20%
20%
20%
2
3
20%
20%
1. increases.
2. decreases.
3. increases and then
decreases.
4. decreases and then
increases.
5. remains constant.
1
4
5
A tennis player on serve tosses a ball
straight up. As the tennis ball travels through
the air, its speed
20%
20%
20%
2
3
20%
20%
1. increases.
2. decreases.
3. decreases and then
increases.
4. increases and then
decreases.
5. remains the same.
1
4
5
A skydiver jumps out of a hovering helicopter. A few
seconds later, another skydiver jumps out, so they both
fall along the same vertical line relative to the helicopter.
Both skydivers fall with the same acceleration. (Assume
g is constant.) The vertical distance between them
33%
33%
33%
1. increases.
2. decreases.
3. stays the same.
1
2
3
A skydiver jumps out of a hovering helicopter. A few
seconds later, another skydiver jumps out, so they both
fall along the same vertical line relative to the helicopter.
Both skydivers fall with the same acceleration. (Assume
g is constant.) The difference in their velocities
33%
33%
33%
1. increases.
2. decreases.
3. stays the same.
1
2
3