The Buoyant Force

Two bricks are the same size. One is made of foam and one is made of stone. They are set in a tank of water. What will happen?

• Both bricks will float

• Both bricks will sink

• The foam brick will sink and the stone brick will float.

• The foam brick will float and the stone brick will sink.

Buoyant forces act on an object in a _____.

• solid

• liquid

• gas

• liquid or gas

A ship stays afloat as long as the buoyant force is

• less than the ship's weight

• equal to the ship's weight

• less than the ship's speed

• greater than the ship's speed

An object will _______ if the weight of it is equal to the weight of the water in which it is in. 

• Float

• Sink

• Expand

• Shrink

An object with a very low buoyant force acting on it will _____.

• Sink

• Float

• Expand

• Shrink

The volume of the liquid an object displaces will be equal to the buoyant force. 

• True

• False

If an object sinks in a fluid, the buoyant force is ____ the

weight of the object.

• greater than

• less than

• the same as

• does not apply

According to the Archimedes’ principle, the buoyant force on an object is equal to the _____ of the fluid that the object displaces.

• mass

• weight

• density

A boat filled with sand that has a weight equal to the weight of the water it displaces.

• Sink

• Float

True or False: Buoyancy is an upwards force measured in Newtons. 

• True

• False