OSTP Science Grade 5 Practice Questions - Oklahoma School Testing Program - Science, Grade 5 Exam

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A student drops a wooden block and a solid iron cube of identical volume into a tub of fresh water. The wooden block floats at the surface, while the iron cube sinks to the bottom. What physical property explains why the wooden block floats while the iron cube sinks?

The wooden block has a lower density than water, while the iron cube has a higher density than water. The iron cube has a larger surface area than the wooden block. The wooden block is attracted upward by Earth's gravitational pull. The iron cube absorbs water and increases its total volume.

Correct Answer:

The wooden block has a lower density than water, while the iron cube has a higher density than water.

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