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AP Physics C: Mechanics
5.2 Connecting Linear and Rotational Motion
5.1 Rotational Kinematics
IntermediateMCQDrawing RepresentationsConceptual21.6k
A schematic diagram showing a top-down view of a flat circular disk. A small filled black circle marks the geometric center of the disk. Inside the circular boundary, centered above the center mark, is a curved arrow pointing counterclockwise. A dashed vertical reference line extends from the center mark to the top edge of the circle. At the intersection of the dashed vertical line and the topmost point of the circular perimeter (the 12 o'clock position), a distinct filled dot is labeled \(P\). A straight dashed horizontal line is tangent to the circle at point \(P\). No other labels, lines, text, or axes appear.
Top view of a circular disk rotating counterclockwise with point \(P\) at the top edge.
A horizontal circular disk rotates counterclockwise about a vertical axis through its center, as viewed from above. At the instant shown, the disk is rotating with angular speed \(\omega\) and has an angular acceleration of magnitude \(\alpha\) directed clockwise, causing the disk to slow down. Which of the following diagrams best represents the direction of the total linear acceleration vector \(\vec{a}\) of point \(P\) on the rim of the disk at this instant?

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