Density and Buoyancy Review

Density is defined as...

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

Tags

NGSS.MS-PS1-2

Looking at the image... can oak float in water? 

• Yes
• No

Tags

NGSS.MS-PS1-2

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) 

True or False: Volume is the amount of matter in a substance. Mass is the amount of space a substance takes up. 

• True
• False 

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

• Un-gravity force 
• Anti-gravity force
• Gravitational pull
• Downwards pull on an object

Tags

NGSS.MS-PS2-4

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

• True
• False

Swim bladders and ballistic tanks in a submarine serve to control the ________________ of a fish and a submarine. 

• Buoyant force
• Neutral buoyancy 
• Average density

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 will result in positive buoyancy?

• When the buoyant force is greater than the force of gravity
• When the buoyant force is equal to the force of gravity
• When the buoyant force is less than the force of gravity

From Friday's lab, when the egg was floating in between the salt water and fresh water, we say it has...

• Positive buoyancy
• Neutral buoyancy
• Negative buoyancy