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.

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

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

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

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

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

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

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

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

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