Density and Buoyancy

How do we calculate density? (with correct units!)

• D = m/v (in g/mL or g/cm3)
• D = v/m (in g/mL or g/cm2) 
• D=m/v (in mL/g or cm3/g) 

Buoyancy is the tendency for objects to float in a fluid. We consider buoyancy the...

• Un-gravity force

• The upward force

• Gravitational pull

• Downwards pull on an object

Pressure at the bottom of the ocean is greatest because:

• The water is most dense at the bottom.
• The water is least dense at the bottom.
• The water is buoyant at the bottom.

If the mass of an object is greater than the buoyant force, the object will:

• Float
• Sink

When you hold an object in the water,

• Water is displaced and rises
• Water is displaced and decreases
• The buoyant force pushes down on the object

When you increase your depth under water, the water pressure on your body

• increases

• decreases

• stays the same

Density is defined as...

• Centimeters cubed per mass of substance
• Mass per unit volume of a substance
• Flow rate of a substance

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. 

Which liquid is the least dense?

• oil
• water
• syrup 
• plastic bottle

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

• buoyancy force

• density force

• fluidity force

• normal force