AP Physics 1
Dynamics MCQ Quiz 1
Test Booklet
Name
1.
An object of mass
is released from rest above the surface of a planet such that the object’s speed as a
function of time is shown by the graph above. The force due to gravity exerted on the object is most nearly
A
B
C
D
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Page 1 of 28
AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
Students work together during an experiment about Newton’s laws. The students use a setup that consists of a cart
of known mass connected to one end of a string that is looped over a pulley of negligible friction, with its other end
connected to a hanging mass. The cart is initially at rest on a horizontal surface and rolls without slipping when
released. The inertia of the cart's wheels is negligible. Students have access to common laboratory equipment to
make measurements of components of the system.
2. By collecting the appropriate data, the students can determine the relationship between the acceleration of
the cart and the net force exerted on the cart. Which of the following graphs should the students produce to
show the correct relationship?
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
A
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
B
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
C
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
D
3.
In a lab, a block weighing 80 N is attached to a spring scale, and both are pulled to the right on a horizontal
surface, as shown above. Friction between the block and the surface is negligible. What is the acceleration
of the block when the scale reads 32 N?
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
A
2.0 m/s2
B
2.5 m/s2
C
4.0 m/s
2
D
6.0 m/s
2
E
8.0 m/s
2
4. A 50.0 N box is at rest on a horizontal surface. The coefficient of static friction between the box and the
surface is 0.50, and the coefficient of kinetic friction is 0.30. A horizontal 20.0 N force is then exerted on the
box. The magnitude of the acceleration of the box is most nearly
A
0 m/s
B
0.5 m/s
2
C
1.0 m/s
2
D
4.0 m/s
2
2
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
5.
The force diagram above shows a box accelerating to the right on a horizontal surface of negligible friction.
The tension is exerted at an angle of
above the horizontal. If is the coefficient of kinetic friction
between the box and the surface, which of the following is a correct mathematical equation derived by
applying Newton’s second law to the box?
A
B
C
D
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
6.
The system shown above is released from rest. If friction is negligible, the acceleration of the 4.0 kg block
sliding on the table shown above is most nearly
A
0
B
1.7 m/s2
C
3.3 m/s
2
D
5.0 m/s
2
E
10.0 m/s
2
7.
Two blocks of masses 1.0 kg and 2.0 kg, respectively, are pushed by a constant applied force F across a
horizontal frictionless table with constant acceleration such that the blocks remain in contact with each
other, as shown above. The 1.0 kg block pushes the 2.0 kg block with a force of 2.0 N. The acceleration of
the two blocks is
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
A
0
B
1.0 m/s2
C
1.5 m/s
2
D
2.0 m/s
2
E
3.0 m/s
2
8. An astronaut in deep space is at rest relative to a nearby space station. The astronaut needs to return to the
space station. A student makes the following claim: “The astronaut should position her feet pointing away
from the space station. Then, she should repeatedly move her feet in the opposite direction to each other.
This action will propel the astronaut toward the space station.” Is the student’s claim correct? Justify your
selection.
A
B
C
D
Yes. The astronaut’s feet exert a force away from the space station, creating an equal and opposite force that
will accelerate the astronaut toward the space station.
Yes. The astronaut’s feet will have a velocity that is transferred to her center of mass, accelerating the
astronaut toward the space station.
No. The astronaut’s feet are not exerting a force on another object, so there is no external force to accelerate
the astronaut toward the space station.
No. The astronaut would move away from the space station, not toward it, since her feet are pointed away
from the space station.
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
9.
Block
of mass
is attached to block of mass
by a light string that passes over a pulley of
negligible friction and mass, as shown above. In which direction will the center of mass
of the twoblock system move after it is released from rest, and what is the magnitude of the acceleration of block
?
A
B
C
D
Down and to the right
Remain at rest
Down and to the right
Remain at rest
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
10.
An Atwood’s machine is set up by suspending two blocks connected by a string of negligible mass over a
pulley, as shown above. The blocks are initially held at rest and then released at time
. The speed of
the
block at time
is most nearly
A
B
C
D
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
11.
An Atwood machine is set up by suspending two blocks connected by a string of negligible mass over a
pulley, as shown in the figure above. The pulley has negligible mass but there is friction as it rotates. The
system is released from rest, and after
the speed of the
block is
. Which of the following
is the best estimate of the external frictional force acting on the two-block system?
A
B
C
D
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
12. A tennis ball is thrown against a vertical concrete wall that is fixed to the ground. The ball bounces off the
wall. How does the force exerted by the ball on the wall compare with the force exerted by the wall on the
ball?
A
The force exerted by the ball is greater.
B
The forces exerted by the ball and the wall have the same magnitude.
C
The force exerted by the ball is smaller.
D
The relative magnitudes of the forces cannot be determined without knowing how long the ball and the wall
are in contact.
13. A ball is moved from Earth to a planet that has a gravitational acceleration that is double that of Earth. How
does the gravitational force on the ball when it is on the new planet compare to the gravitational force on the
ball when it is on Earth?
A
B
C
D
The gravitational force on the ball when it is on the new planet is double the force on the ball when it is on
Earth.
The gravitational force on the ball when it is on the new planet is half the force on the ball when it is on
Earth.
The gravitational force on the ball when it is on the new planet is the same as the force on the ball when it is
on Earth.
The gravitational force on the ball when it is on the new planet is one-fourth the force on the ball when it is
on Earth.
14. In one experiment, a student rolls a 2 kg ball such that it collides with a wall with a force of 10,000 N. In a
second experiment, the student rolls a 5 kg ball such that it collides with the wall at a force of 5000 N. In
both experiments, the balls bounce back from the wall and eventually come to rest. Which of the following
statements is true regarding the force that the wall exerts on each ball?
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
A
B
C
D
15.
The wall exerts the same force on both balls since they both bounce back from the same wall in both
experiments.
The wall exerts a greater force on the 5 kg ball than on the 2 kg ball since a greater force is required to cause
the heavier ball to bounce back from the wall.
The wall exerts a greater force on the 2 kg ball than on the 5 kg ball since the force from the wall on each
ball is equal to the force that each ball exerts on the wall.
The answer cannot be determined without knowing the distance each ball rolls before coming to rest.
A block is pulled along a surface of negligible friction by a spring scale that exerts a force
The mass of the block is
, and the spring scale reads
on the block.
. Which of the following free-body diagrams
can be used to show the magnitude and direction of all the forces exerted on the block as it is pulled along
the surface?
A
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
B
C
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
D
16.
The free body diagram shown above is for a
box on a rough surface being pulled to the right at a
constant speed by a string that is at an angle of
above the horizontal. The coefficient of kinetic friction
between the box and the surface is
. The tension in this string is most nearly
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
A
B
C
D
17.
The system shown above consists of two identical blocks that are suspended using four cords, each of a
different length. Which of the following claims are true about the magnitudes of the tensions in the cords?
Select two answers.
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
A
B
C
D
18.
Three identical blocks, , , and , hang from identical strings, as shown in the figure. Which of the
following free-body diagrams could represent the forces exerted on block ?
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
A
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
B
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
C
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
D
19.
A cart with an unknown mass is at rest on one side of a track. A student must find the mass of the cart by
using Newton’s second law. The student attaches a force probe to the cart and pulls it while keeping the
force constant. A motion detector rests on the opposite end of the track to record the acceleration of the cart
as it is pulled. The student uses the measured force and acceleration values and determines that the cart’s
mass is
. When placed on a balance, the cart’s mass is found to be
. Which of the following
could explain the difference in mass?
A
The track was not level and was tilted slightly downward.
B
The student did not pull the cart with a force parallel to the track.
C
The wheels contain bearings that were rough and caused a significant amount of friction.
D
The motion sensor setting was incorrect. The student set it up so that motion away from the sensor would be
the negative direction.
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
20.
A block of mass
and a block of mass
are connected by a string, as shown above. The blocks are held
with the string horizontally and are released from rest at the same time from a height above the ground.
How does the acceleration of the center of mass of the system compare to the acceleration of the object of
mass
?
A
The acceleration of the center of mass is
B
The acceleration of the center of mass is one fourth the acceleration of the object of mass
C
The acceleration of the center of mass is the same as the acceleration of the object of mass
D
times the acceleration of the object of mass
The acceleration of the center of mass is initially
.
.
.
times smaller than the acceleration of the object of mass
, but the accelerations are the same after a long time.
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
21.
The diagram above represents the forces exerted on a box that a child is holding.
represents the force
applied by the child’s hand, and
represents the weight of the box. The child begins to raise the box with
increasing speed. Which of the following claims is correct about force
that is exerted by the box on the
child’s hand as the box is being raised?
A
, where
does not change as the child raises the box.
B
, where
is larger as the box is being raised than when it was being held.
C
, where
does not change as the child raises the box.
D
, where
is larger as the box is being raised than when it was being held.
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
Two blocks are connected by a rope, as shown above. The masses of the blocks are
for the upper block and
for the lower block. An upward applied force of magnitude acts on the upper block.
22.
If the net acceleration is downward but has a magnitude less than , then which has the larger magnitude,
the force or the tension in the rope?
A
The tension in the rope
B
Force
C
Neither. They have equal but nonzero magnitudes.
D
Neither. They have equal zero magnitudes.
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
Refer to the following material to answer the questions.
The stacks of boxes shown in the figure above are inside an elevator that is moving upward. The masses of the
boxes are given in terms of the mass M of the lightest box.
23. Assume the elevator has upward acceleration a, and consider the stack that has two boxes of mass M. What
is the magnitude of the force exerted on the top box by the bottom box?
A
Mg
B
Ma
C
M(a - g)
D
M (a + g)
24. How does the magnitude of the force exerted by the top box on the bottom box compare with the magnitude
of the force exerted by the bottom box on the top box for each of the stacks?
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AP Physics 1
Test Booklet
Dynamics MCQ Quiz 1
A
The two magnitudes are always equal in each of the stacks.
B
The two magnitudes are always different in each of the stacks.
C
D
The two magnitudes are equal when the boxes have equal mass and different when the boxes have different
masses.
The two magnitudes are equal when the elevator is moving at constant speed and different when it is
accelerating.
Three objects can only move along a straight, level path. The graphs below show the position d of each of the
objects plotted as a function of time t.
25. The sum of the forces on the object is zero in which of the cases?
A
II only
B
III only
C
I and II only
D
I and III only
E
I, II, and III
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