12. Buoyancy is the tendency of an object to float. A diver demonstrates neutral buoyancy when the…

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A. force of gravity equals force of buoyancy

B. force of buoyancy is greater than force of gravity

C. force of buoyancy is less than force of gravity

D. force of gravity does not affect force of buoyancy

 

13. Large ocean liners, and cargo ships, can float on the water because ...

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A. its average density is lower than saltwater

B. the metal it was made of is less dense than water

C. the metal is more dense and therefore can float

D. saltwater is more dense and can hold up steel

 

14. Archimedes principle states that 'the buoyant force acting on an object equals the ...

A. mass of the fluid displaced by the object

B. force that holds the object afloat

C. weight of the object displaced by the fluid

D. weight of the fluid displaced by the object

 

15. Fresh and saltwater systems have different densities. All cargo ships have a special line that shows how much the ship should be safely loaded so it won’t sink as it goes from freshwater to saltwater. This line is called the …

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A. Sinking Line

B. Buoyancy Line

C. Plimsoll Line

D. Density Line

 

16. Density and buoyant force are related. As the ...

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A. density of a fluid increases, the buoyant force decreases

B. density of a fluid decreases, the buoyant force increases

C. density of a fluid increases, the buoyant force remains the same

D. density of a fluid decreases, the buoyant force decreases

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17.  In your own words, define buoyancy. Use the words float, sink, force, gravity

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18. Use the particle model of matter to describe what happens to the density of a subssance when it cools

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19. According to the videos you watched, why is the plimsoil line so important?