Fluids Review

If an object sinks in a fluid, _____.

• the density of the fluid is greater than the density of the object
• the density of the fluid is less than the density of the object
• the density of the fluid is equal to the density of the object
• density has nothing to do with whether an object sinks or floats, only which state of matter the object is

Archimedes' Principle states that... 

• The buoyant force acting on an object equals the volume of the fluid displaced by the object. 
• The buoyant force acting on an object equals the weight (force of gravity) of the fluid displaced by the object.
• The buoyant force acting on an object will always be equal. 

If you blow air between these two balloons, the pressure between the balloons would_________.

• Increase
• Decrease
• Stay the same

Think about Bernoulli's Principle.  What do you think will happen when you have running water next to a shower curtain?

• Curtain goes outward from the shower
• Curtain goes in towards the shower
• Curtain stays the same
• Water gets the curtain wet

A ship will sink as long as the buoyant force is

• less than the ship’s weight

• equal to the ship’s weight

• greater than the ship’s speed

• less than the ship’s speed

What is true about the volume of displaced fluid for an object that is completely submerged?

• The volume of displaced fluid is equal to the object’s volume.

• The volume of displaced fluid is less than the object’s volume.

• The volume of displaced fluid is greater than the object’s volume.

• The volume of displaced fluid is not related to the object’s volume.

Which of the following statements is true about the buoyant force on an object that is floating on the surface of a lake?

• The buoyant force is greater than the weight of the object.

• The buoyant force is equal to the weight of the fluid displaced.

• The buoyant force is the same as when the object is completely submerged.

• The buoyant force is less than the density of the water.

In which of the following situations will an object sink?

• The mass density of the object is less than the mass density of the fluid.

• The buoyant force on the object is equal to the weight of the object.

• The mass density of the fluid is less than the mass density of the object.

• The weight of the fluid displaced equals the weight of the object.

Which statement about an object placed in water is correct?

• The apparent weight is always less than the weight of the object in air.

• The apparent weight is always equal to the weight of the fluid displaced.

• The apparent weight is never equal to zero.

• The apparent weight is never greater than the buoyant force.

What is the formula for pressure?

• P = F / A

• P = F A

• P = A / F

• F = P / A