
AP Quiz Rotational motion Version 2
Authored by Adriana Gheta
Physics
11th - 12th Grade
Used 27+ times

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12 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A rod of length 2D0 and mass 2M0 is at rest on a flat, horizontal surface. One end of the rod is connected to a pivot that the rod will rotate around if acted upon by a net torque. A sphere of mass m0 is launched horizontally toward the free end of the rod with velocity v0, as shown in the figure. After the sphere collides with the rod, the sphere sticks to the rod and both objects rotate around the pivot with a common angular velocity. Which of the following predictions is correct about angular momentum and rotational kinetic energy of the sphere-rod system immediately before the collision and immediately after the collision?
The angular momentum immediately before the collision is greater than the angular momentum immediately after the collision.
The rotational kinetic energy immediately before the collision is greater than the rotational kinetic energy immediately after the collision.
The angular momentum immediately before the collision is greater than the angular momentum immediately after the collision.
The rotational kinetic energy immediately before the collision is equal to the rotational kinetic energy immediately after the collision.
The angular momentum immediately before the collision is equal to the angular momentum immediately after the collision. The rotational kinetic energy immediately before the collision is greater than the rotational kinetic energy immediately after the collision.
The angular momentum immediately before the collision is equal to the angular momentum immediately after the collision. The rotational kinetic energy immediately before the collision is equal to the rotational kinetic energy immediately after the collision.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Two objects are released from rest at the top of a ramp with the same dimensions, as shown in the figure. The sphere rolls down one ramp without slipping . The small block slides down the other ramp without friction. Which objects reaches the bottom of its ramp first, and why?
The sphere, because it gains rotational KE, but the block does not
The sphere, because it gains mechanical energy due to the torque exerted on it, but the block does not
The block, because it does not lose mechanical energy due to friction, but the sphere does
The block, because it does not gain rotational kinetic energy, but the sphere does
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The figure above shows the forces exerted on a block that is sliding on a horizontal surface: the gravitational force of 40N, the 40 N normal force exerted by the surface, and a frictional force exerted to the left. The coefficient of friction between the block and the surface is 0.2. The acceleration of the block is most nearly
1.0 m/s2 to the right
1.0 m/s2 to the left
2.0 m/s2 to the right
2.0 m/s2 to the left
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The diagram above shows a top view of a child of mass M on a circular platform of mass 2M that is rotating counterclockwise. Assume the platform rotates without friction. Which of the following describes an action by the child that will increase the angular speed of the platform-child system and gives the correct reason why?
The child moves toward the center of the platform, increasing the total angular momentum of the system
The child moves toward the center of the platform, decreasing the rotational inertia of the system
The child moves away from the center of the platform, increasing the total angular momentum of system
The child moves away from the center of the platform, decreasing the rotational inertia of the system.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A uniform ladder of mass M and length L rests against a smooth wall at an angle θ0 , as shown in the figure. What is the torque due to the weight of the ladder about its base?
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A graph of the angular velocity ω as a function of time t is shown for an object that rotates about an axis. Three time intervals, 1–3, are shown. Which of the following correctly compares the angular displacement Δθ of the object during each time interval?
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A wheel with radius 0.33 m and rotational inertia 2.0 kg⋅m2
spins on an axle with an initial angular speed of 3.0 rad/s. Friction in the axle exerts a torque on the wheel, causing the wheel to stop after 6.0 s. The average torque exerted on the wheel as it slows down has magnitude
0.5 Nm
1 Nm
2 Nm
3 Nm
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