Concepts, 1D Kinematics
Lead Author(s): University of Colorado Boulder
Source: UC Boulder PhET
Student Price: FREE
This pack is intended for incoming freshman physics students: it covers basic concepts such as scientific notation and units, along with introductory notions of 1D motion.
This content is licensed under the Creative Commons Attribution 4.0 International License.
[Mazur] An object goes from one point in space to another. After it arrives at its destination, the size of its displacement is ___ than the distance it traveled.
either greater than or equal to
always equal to
either smaller than or equal to
could be smaller or larger
[UColorado] Steve is pacing back and forth in lecture. He starts at x =+10 (measured in dm from the edge of the bench), moves right to x=+30, moves back left to +20, then finally moves right to +50, as shown. What is the distance travelled, and the displacement?
Distance = +40, displacement = +40 (dm)
Distance = +60, displacement = +40 (dm)
Distance = +40, displacement = +60 (dm)
Distance = +60, displacement = +60 (dm)
[UColorado] An ant crawling along the floor follows a semicircular path, going half way around the circumference of a circle of radius R.
The distance travelled, and the displacement of the ant, are respectively:
Distance = $\pi R$, displacement = $\pi R$
Distance = $2R$, displacement = $\pi R$
Distance = $\pi R$, displacement = $2R$
Distance = $\pi R$, displacement = $0$
None of these
[UColorado] A race car (shown as a dot) is moving as shown in the one dimensional motion diagram. Throughout the period of time shown, what are the signs of position, x, and velocity, v?
x:, v: 
x:, v:+
x:+, v:
x:+, v:+
None of these/Not sure
[UColorado] A race car (shown as a dot) is moving as shown in the one dimensional motion diagram. Throughout the period of time shown, what is the sign of acceleration, a?
+

Not enough information/not sure
[UColorado] A person starts in Boulder, drives to Denver (50 km away) in 1 hour, stays in Denver 1 hour, then speeds back to Boulder in 30 minutes. What is the average speed of the round trip?
25 km/hr
67 km/hr
40 km/hr
75 km/hr
none of these
[UColorado] A marathon runner runs at a steady 15 km/hr. When the runner is 7.5 km from the finish, a bird begins flying from the runner to the finish at 30 km/hr. When the bird reaches the finish line, it turns around and flies back to the runner, and then turns around again, repeating the backandforth trips until the runner reaches the finish line. How many kilometers does the bird travel?
10 km
15 km
20 km
Not sure/ impossible to decide
[Mazur] A person initially at point 3 on the xaxis stays there for a while and then strolls along the xaxis to point 1, stays there for a bit and then runs to point 2 and remains there. Which of the following graphs depicts this motion?
a
b
c
d
None of the above
[UColorado] The "multiflash photograph" below shows a ball rolling along a surface. The camera flashed once a second, and the time is shown above each image. Which graph best represents the ball's motion?
a
b
c
d
none of these is remotely correct.
[UColorado] Order the speeds at times 1, 2, and 3 from the slowest to the fastest.
[math]s_1 < s_2 < s_3[/math]
[math]s_2 < s_1 < s_3[/math]
[math]s_3 < s_1 < s_2[/math]
[math]s_3 < s_2 < s_1[/math]
None of these/not sure
[UColorado] A train moves along a straight track and a graph of its position vs time looks like the top graph. Which of the graphs below depicts the train's velocity as a function of time?
a
b
c
d
None of these
[UColorado] A train moves along a straight track and its position vs. time is shown in the top graph.
Which graph best depicts the train's velocity vs. time?
a
b
c
d
None
[UColorado] Which object, A or B, has the higher speed?
a
b
[UColorado] A particle starts at the origin. Below is a graph of velocity vs. time. What is the approximate position at t=3 sec?
3m
6m
9m
18m
None of these/not enough information.
[Mazur] A train car moves along a long straight track. The graph shows the position as a function of time for this train. The graph shows that the train:
speeds up all the time.
slows down all the time.
speeds up part of the time and slows down pa
moves at a constant velocity.
[Mazur] The graph shows position as a function of time for two trains running on parallel tracks. Which is true:
At time $t_B$, both trains have the same velocity.
Both trains speed up all the time.
Both trains have the same velocity at some time before $t_B$.
Somewhere on the graph, both trains have the same acceleration.
[UColorado] A train moves along a straight track and a graph of its position vs time is shown in the top graph. Which of the graphs below depicts the train's acceleration as a function of time?
a
b
c
d
None of these
[UColorado] A truck traveling at 50 km/hr (about 14 m/s) approaches a car stopped at a red light. When the truck is 100 m from the car, the light turns green and the car immediately begins to accelerate at 2 m/s2 to a final speed of 100 km/hr. Which graph represents this situation?
a
b
c
None of these
[UColorado] I drop a book at t=0. Which plot below best represents position as a function of time?
a
b
c
d
[UColorado] I drop a book at t=0. Which plot below best represents velocity as a function of time?
a
b
c
d
[UColorado] An elevator is going up at a constant speed. Near the top floor, it starts to slow to a stop. During the period that it is slowing down, its acceleration is:
downward.
upward.
in some other direction.
[UColorado] A ball is thrown straight upward. At the top of its trajectory, its acceleration is..
zero
straight up
straight down
depends on the mass of the ball
[UColorado] A ball is fired straight downward out of a special springloaded gun, which produces constant acceleration. Upward is chosen as the positive direction. Assume that air resistance is negligible. Which graph properly represents acceleration of the ball?
a
b
c
d
[Mazur] A person standing at the edge of a cliff throws one ball straight up and another ball straight down at the same initial speed. Neglecting air resistance, which ball has the greater speed when it hits the ground?
The ball thrown upward.
The ball thrown downward.
Neither—they both hit at the same speed.
[Mazur] If you drop an object in the absence of air resistance, it accelerates downward at $9.8 m/s^2$. If instead you throw it downward, its downward acceleration after release is
less than $9.8 m/s^2$
$9.8 m/s^2$
$more than 9.8 m/s^2$
[Mazur] A ball is thrown straight up. At the top of its trajectory, its
velocity is zero, acceleration is zero
velocity is nonzero, acceleration is nonzero.
velocity is zero, acceleration is nonzero.
velocity is nonzero, acceleration is zero.
[UColorado] On Planet X, a rock is thrown straight up. The position and velocity of the ball at various times are listed in the table. (Note: "up" is chosen as the "+" direction.) What is the acceleration due to gravity on Planet X?
5 $m/s^2$
10 $m/s^2$
15 $m/s^2$
20 $m/s^2$
None of these
[UColorado] A ball is launched straight up with some initial velocity. (Neglect air resistance.) If the initial velocity is doubled, the time to reach the apex of the trajectory...
doubles.
increases by a factor of 4.
Neither of these.
Not enough information given.
[UColorado] A ball is launched straight up with some initial velocity. (Neglect air resistance.) If the initial velocity is doubled, the maximum height of the ball...
doubles.
increases by a factor of 4.
Neither of these.
Not enough information given.
[UColorado] A helicopter takes off vertically, with a constant speed $v_0$. While rising, the pilot releases a cigarette butt. (Neglect air resistance!) The cigarette will...
Initially rise with speed $v_0$, reduce its speed, come to rest, and then increase its speed as it goes down.
Not go up at all, but will start to gain downwards speed as it drops to the ground.
Drop to the ground with a constant speed.
[UColorado] A square with edge length L is made larger and larger.
As the square grows, the ratio $\frac{lengthofperimeter}{area}$...
increases
decreases
remains constant
I have no idea
[UColorado] One meter is 100 $cm$. If you have a hot tub with a volume of 1 cubic meter $(1 m^3)$, how many cubic centimeters is that?
100cm^3
1,000cm^3
1,000,000cm^3
1,000,000,000cm^3
None of these/not sure
[UColorado] A notation question:
$10^5=?$
1E5
10E5
something else
No idea
[UColorado] As I walk, what is my typical speed?
0.2 m/s
2.0 m/s
20 m/s
Impossible  I need a calculator...