Understanding Fluids and Buoyancy

What is a fluid?

• Any substance that can flow and alter its shape

• A solid object that can support weight

• A substance that cannot change its shape

• A gas that cannot be compressed

Which of the following are considered fluids?

• Solids and gases

• Liquids and gases

• Only solids

• Only liquids

What property is defined as mass per unit volume?

• Buoyancy

• Density

• Viscosity

• Elasticity

What does the buoyant force act against?

• Frictional force

• Magnetic force

• Electrical force

• Gravitational force

According to Archimedes' principle, the buoyant force on an object submerged in a fluid is equal to what?

• The weight of the object

• The mass of the fluid

• The volume of the fluid

• The weight of the fluid displaced

Why does a cruise ship float?

• Because it displaces a weight of water equal to or greater than its own

• Because it is very large

• Because it displaces a weight of water less than its own

• Because it is made of steel

What happens when you fully submerge an object in water?

• It displaces a volume of water equal to its own volume

• It sinks immediately

• It floats regardless of its density

• It does not displace any water

What was Archimedes' famous exclamation?

• I have found it!

• It works!

• This is amazing!

• Eureka!

What determines if an object will float or sink?

• The color of the object

• The size of the object

• The density of the object compared to the fluid

• The temperature of the water

How can the buoyant force be expressed?

• As the gravitational force of the displaced fluid

• As the volume of the object submerged

• As the density of the fluid only

• As the mass of the object only