Buoyancy Quiz

What is buoyant force?

• The weight of an object immersed in a fluid

• The force exerted by a fluid on an object in the fluid

• A force that causes an object in fluid to sink

• A force that causes an object to move in fluid

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What direction does buoyant force act on an object immersed in a fluid?

• Downward on the immersed object

• Upward on the immersed object

• To the left or right of the immersed object

• In the same direction of gravity

Buoyant force is equal to:

• The volume of the displaced fluid

• The weight of the immersed object

• The volume of the immersed object

This is what happens to an object when the gravitational force is stronger than the buoyant force.

• sinks

• floats

• neutrally buoyant

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This is what happens to an object when the buoyant force is stronger than the gravitational force.

• sinks

• floats

• neutrally buoyant

If we place an empty sealed plastic bottle in water, we know it will float. What could we do to make it sink?

• You can't make a plastic bottle sink

• Increase mass (fill it with coins)

• Fill the bottle with helium

• Decrease mass (use a bottle made out of lighter plastic)

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If an object, such as a ball of clay sinks, what would we need to do to its volume/surface area to make it float?

• Clay can't float

• Increase the volume

• Decrease the volume

• Keep the volume the same

Why can anyone float in the Dead Sea?

• It is made of fresh water, making the water less dense.

• It is super-salty, making the water super dense.

• It is similar to pool water.

• They can't. People who are heavier will still sink.

If buoyancy is equal to or greater than the weight of an immersed object, the object will....

• Float

• Sink

• Neutrally buoyant

If buoyancy is less than the weight of the object, the object will...

• Float

• Sink

• Neutrally buoyant