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SAT® Subject Test in Physics

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Moderate

Block and Wall Friction

SATPHY-LN15QT

Each of the diagrams below shows a block being pushed by a horizontal force against a vertical wall. The coefficients of friction between the walls and blocks are shown ($µ$). The masses of the blocks are shown. The amounts of horizontal force applied to each block are shown. All blocks are sliding down the wall because of the gravitational force acting on them.

In which situation is the frictional force between the wall and the block greatest?

A
B
C
D
E