2018 #3 Free Response Question - AP Physics 1 - Exam Solution

The video tutorial covers question #3 from the 2018 AP Physics One exam, focusing on a spinning disk affected by frictional torque. It guides students through solving parts A to D, including graphing angular velocity and acceleration, deriving rotational inertia, and modeling torque with reduced friction. Emphasis is placed on careful graph drawing, as it accounts for a significant portion of the exam points.

Describe the relationship between angular velocity and angular acceleration for the disk as it comes to rest.

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Explain how the presence of friction affects the motion of the disk.

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What does a horizontal line on the angular acceleration graph indicate?

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What is the significance of the graphs drawn in Part A of the problem?

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Why is it important to carefully draw the graphs in this problem?

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What is the equation for rotational inertia derived in Part B, and what does it represent?

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How does the introduction of oil change the behavior of the disk's angular velocity over time?

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How does the angular acceleration change from Part A to Part C?

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Discuss the implications of the torque equations presented in Part D.

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What are the key differences between the two torque equations provided in the problem?

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