Buoyancy

Buoyancy is best described as

• the force which allows that would normally sink to float

• a force which pulls objects toward the center of the earth

• mass minus volume

• a lifeboat

Answer explanation

Aerogel is so buoyant it could carry about 1000 grams of cargo!!!

The best example of buoyancy is a

• ship

• plane

• the ocean

• Jon Osloff

Answer explanation

Archimede's Principle is

• Mass of the water is less than the force of buoyancy

• the mass of water displaced by the volume of a boat is equal to to the force of buoyancy which pushes upward on the boat causing it to float

• the volume of water which displaces the buoyancy causing the boat to float

• Outdated and not used in science anymore

How do you get a chunk of dense metal to float instead of sink

• Nothing, you cannot change the shape

• add a less dense metal to the original metal

• Increase the volume of the metal by flattening its shape

• compress the metal

Answer explanation

Water has a density of

• cannot be determined

• 1.0grams/cm3

• 10grams/cm3

• 1 gram

Answer explanation

_____ force is an upward force that fluids exert on any object that is placed in them.

• Buoyant

• Gravity

• Torque

Assume you have an ice cube and also a small rock that is the same size and shape as the ice cube. Predict what would happen if you placed the ice cube and rock in a glass of water.

• The ice cube and rock will both float.

• The ice cube will sink and the rock will float.

• The ice cube will float and the rock will sink.

• The ice cube and rock will both sink.

An object floats in a fluid when the buoyant force acting on the object is

• acting above the object.

• less than the object’s weight.

• acting under the object.

• equal or greater than the object’s weight.

Buoyant force is a/an _______ force that fluids exert on any object that is placed in them.

• Upward

• Downward

If a body weighs 600 gf in the air but appears to only weight 450 gf when completely immersed in water, then the upthrust on the body by the water is _____ .

• 600 gf

• 450 gf

• 1050 gf

• 150 gf