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AP Physics C: Mechanics
2.5 Newton’s Second Law
2.2 Forces and Free-Body Diagrams
IntermediateMCQConceptual16.5k
A solid horizontal line represents the floor. Resting on the floor is a right-triangular wedge with a vertical edge on the left, a horizontal edge on the bottom, and a straight inclined surface sloping downward from the top of the vertical edge to the horizontal floor on the right. At the bottom-right vertex, an angle arc between the horizontal floor and the inclined surface is labeled \(\theta\). A small rectangular block labeled \(m\) rests flat against the inclined surface. To the left of the vertical face of the wedge, a single horizontal arrow points directly to the right and is labeled \(a\). No other labels, lines, text, or axes appear.
A block of mass m on an inclined wedge accelerating horizontally to the right.
A block of mass \(m\) rests on the frictionless inclined surface of a wedge that makes an angle \(\theta\) with the horizontal, as shown in the figure.

The wedge is accelerated horizontally to the right across a horizontal floor with a constant acceleration of magnitude \(a\), and the block maintains contact with the incline throughout the motion.

Compared to when the wedge is stationary, how does the magnitude of the normal force exerted by the incline on the block change, and why?

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