Observe the figures of an object placed in different liquids.
a. Compare the gravitational force and the buoyance acting on the body when it is in the liquids A, B and C.
b. If the body is a solid substance, which is the liquid whose density is equal to that of the solid?
a. The body sinks deepest in C, less deep in B, and floats in A. So the buoyant force is largest in A, then B and then C; it acts against the weight and pushes the body upward. The gravitational force which acts downward, is thus highest in C, followed by B, followed by A.
b. Liquid A has density equal to the solid. That’s why the gravitational force (weight of body in air) is equal to the buoyant force (i.e. the weight of displaced liquid), and the body floats.
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