2023, Question 5 · Short Answer · 7 points · about 13 minutes
Rod and sphere falling over on an axle
Use video frames to pick where angular acceleration and rotational kinetic energy are largest, derive the kinetic energy gained as the rod swings down, and explain the gain without Earth in the system.
This exam had five free-response questions in 90 minutes, worth 7 or 12 points each. The current exam has 4 free-response questions in 95 minutes. The skills these questions practice still count.
Lessons this question draws on
1 Read the question
The question is College Board's, from the 2023 exam. It starts on page 15 of the PDF.
Open Question 5 (PDF, page 15)
2 Write your answer
Answer each part the way you would on the exam, in full sentences, with your work shown. Your writing saves as you type.
3 Score it
Score your answer against College Board's scoring guidelines, one point at a time. Give yourself a point only when your answer says what the guideline asks for.
Scoring guidelines (PDF, page 17) What the exam readers saw (Chief Reader report)
Question, scoring guidelines and Chief Reader report: College Board. The title and summary are ours.