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AP Physics 1 6.4.B: System Choice & Angular Momentum

Practise AP Physics 1 6.4.B by choosing a system boundary, identifying external torque, and explaining whether angular momentum is conserved or transferred.

Syllabus
Effective Fall 2025
Course
AP Physics 1: Algebra-Based

Exam points

  • Identify whether friction exerts external torque on a disk–rod system and changes its angular momentum.
  • Explain angular momentum transfer when one part of a rotating system gains and another loses it.

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

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

(7 points, suggested time 13 minutes) Two ladybugs are standing on a rotating disk that is spinning counterclockwise, as shown in the figure above. Assume that friction in the bearings of the axle is negligible.

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

(b) Ladybug A begins walking in a circular path in the direction of the disk's rotation. Does the magnitude of the angular momentum of the disk alone (not the ladybugs-disk system) increase, decrease, or stay the same? Increase Decrease Stay the same Briefly explain your reasoning.

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