Below you will find a set of 5 conceptual and numerical revision questions selected randomly from lots of questions I have put together covering the material in Chapter 10, "Conservation of Angular Momentum". This includes questions on the vector nature of rotation, torque and angular momentum and conservation of angular momentum. When you have finished the quiz, click on the "Submit Quiz" button at the bottom and within seconds it will be automatically graded and the results returned to you!

To select a new set of questions click on the "Reload" or "Refresh" button on your browser. You may find some of the questions duplicated but that's the nature of a random selection. Try it a few times ... it's not fattening and you may learn something!

Many thanks to Mark Wood for producing the quiz-maker code.

Q1: A phonograph turntable in the x-z plane is rotating clockwise as viewed from above.

The vector that represents the torque with which the motor turns the table is

1
2
3
4
5

---

Q2: Vectors S and T lie in the x-y plane.

The vector product T ¥ (S ¥ T) could be represented by vector

A
B
C
D
E

---

Q3: The angular momentum of a flywheel about its axis is 925 kg.m²/s. If its moment of inertia about the same axis is 2.50 kg.m², its angular velocity is

370 rev/min
62 rev/min
36 rev/min
2210 rad/s
370 rad/s

---

Q4: A 3.0 kg ball moves in a straight line at 10 m/s as shown in the figure below.

At the instant shown, what is its angular momentum about the point P?

30 kg.m²/s
90 kg.m²/s
120 kg.m²/s
150 kg.m²/s
zero

---

Q5: A solid sphere of radius R rotates about a diameter with an angular speed w. The sphere then collapses under the action of internal forces to a final radius R/2. What is the final angular speed of the sphere?

w/4
w/2
w
2w
4w

---

Click on the Submit Quiz button below to have your quiz automatically graded.

Please note that you may be able to use the "Back" and "Forward" buttons on your browser to check the answers with the questions.