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AP Physics 1
8.3 Fluids and Newton’s Laws
2.3 Newton’s Third Law
Multi-Unit
AdvancedMCQConceptual15.8k
A schematic drawing of a laboratory setup. A horizontal digital scale rests on a flat surface. On top of the scale sits an open cylindrical beaker containing water. A solid rectangular block is fully submerged in the water, hanging from a single vertical string that extends upward out of the frame. The block is suspended in the center of the liquid without touching the sides or bottom of the beaker. No arrows, force vectors, or mathematical notations are present.
A suspended block submerged in a beaker of water resting on a scale.
A beaker partially filled with water rests on a digital scale that measures the normal force exerted on the beaker. A solid metal block suspended by a vertical string is slowly lowered into the water until it is fully submerged. The block is held stationary and does not touch the bottom or sides of the beaker, and no water spills out. The reading on the digital scale increases. Which of the following statements provides the correct physical explanation for why the scale reading increases?

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