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AP Physics 1
6.4 Conservation of Angular Momentum
6.3 Angular Momentum and Angular Impulse
5.3 Torque
4.4 Elastic and Inelastic Collisions
4.3 Conservation of Linear Momentum
4.1 Linear Momentum
Multi-Unit
IntermediateMCQConceptual21.4k
Two side-by-side line drawings showing a rotational apparatus. On the left, labeled 'Before the Disk Drops', a vertical cylindrical axle stands upright. At its base is a wide horizontal circular platform labeled 'Platform'. A curved arrow on the front left edge points horizontally to the left, indicating rotation. Higher up along the same vertical axle is a smaller horizontal disk shaded gray, labeled 'Disk'. On the right, labeled 'After the Disk Drops', the vertical axle and platform are shown with the smaller shaded disk resting directly centered on top of the platform. A matching curved arrow on the front left edge of the platform points horizontally to the left. No other labels, lines, text, or axes appear.
A disk dropped onto a rotating platform before and after contact.
A platform is initially rotating on smooth ice with negligible friction, as shown above. A stationary disk is dropped directly onto the center of the platform. A short time later, the disk and platform rotate together at the same angular velocity, as shown at right in the figure. How does the angular momentum of only the platform change, if at all, after the disk drops? And what is the best justification.

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