Buoyancy

The upward force exerted by a fluid is called the...

• buoyant force

• density force

• fluidity force

• normal force

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

​ (a)  

• It will float

• It will sink

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NGSS.MS-PS2-4

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

​ (a)  

• It sinks

• It floats

True or false. If something has buoyancy it is able to float.

• True

• False

 Whose principle says buoyant force = the weight of the fluid an object displaces 

• Archimedes

• Pascal

• Bernoulli

• Einstein 

Why does a steel ship float, while a block of the same steel sinks?

• shape of object

• air is lighter than water

• the block's buoyancy is less than its weight

• all of the above

Why do boats float?

• The material they are made up of.

• Their volume gives them a large density.

• Their hollow shape leads to a low density.

• The number of passengers is not too high.

A helium balloon floats in air because

• there is more air than helium.

• helium is equally dense as air.

• helium is less dense than the air.

• helium is as dense as the air.

An object will rise up in a fluid if

• Gravity and buoyant force equal

• Density of object and fluid is equal

• The buoyant force is stronger than gravity

• If the density of the object is greater than the fluid

What is the principle that explains why objects float or sink in a fluid?

• Archimedes' Principle

• Pascal's Law

• Newton's First Law

• Bernoulli's Principle