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AP Physics C: Mechanics
2.7 Kinetic and Static Friction
2.5 Newton’s Second Law
AdvancedMCQProportional AnalysisConceptual18.4k
A 2D schematic diagram of a right-triangular wedge representing an inclined plane resting on a horizontal surface. The hypotenuse of the wedge forms an incline that slopes upward to the left, making an angle labeled \(\theta\) with the horizontal base at the lower right. A rectangular block labeled 2 rests on the inclined surface with its base aligned parallel to the slope. A second, smaller rectangular block labeled 1 rests on top of block 2, aligned parallel to block 2. A single straight arrow labeled \(a\) is positioned near the blocks, pointing downward along and parallel to the incline. No other arrows, coordinate axes, force vectors, or labels appear.
Block 1 stacked on block 2 sliding down an incline of angle \(\theta\).
A block of mass \(m_1\) is placed on top of a block of mass \(m_2\), which rests on a surface inclined at an angle \(\theta\) above the horizontal. The coefficient of kinetic friction between block 2 and the incline is \(\mu_2\), and the coefficient of static friction between block 1 and block 2 is \(\mu_s\), where \(\mu_s > \mu_2\). When the system is released from rest, the two blocks slide down the incline together without slipping relative to each other. If the incline angle \(\theta\) is increased such that the blocks still slide together, which of the following statements correctly describes the change in the magnitude of the static friction force exerted on block 1 by block 2, and provides the correct justification?

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