AP Physics C: Mechanics 6.4.B: System Choice & Angular Momentum

Practise AP Physics C: Mechanics 6.4.B by deciding whether a cylinder’s angular momentum changes when friction exerts an external torque on the selected system.

Exam points

Decide whether a rolling cylinder conserves angular momentum by identifying external frictional torque.
Use the cylinder’s changing angular velocity to justify that its angular momentum is not constant.

[Maximum number: 1]

Figure for Question 6.4.B—Describe how the selection of a system determines whether the angular momentum of that system changes question 1 — AP Physics C: Mechanics

3．A cylinder of mass M and radius R is released from rest at the top of an inclined plane，as shown above． The cylinder rolls without slipping down the incline．The rotational inertia of the cylinder is $M R^{2} / 2$ ．

（b）Is the angular momentum of the cylinder conserved as the cylinder rolls down the vertical distance h ？ Yes No Justify your answer．

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6.4.B—Describe how the selection of a system determines whether the angular momentum of that system changes question 1