Conceptual Physics Buoyancy

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-PS2-5

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

How could you make plastic sink and steel float?

• You can't 
• Change the shape and therefore surface area 
• Remove some mass 

Which box has a higher density?  

• Box A
• Box B
• cannot be determined
• they are the same

Compared to a man standing on a tall mountain, a man standing at sea level 

• has less atmospheric pressure on him 
• has more atmospheric pressure on him 
• weighs less 
• has more mass 

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

• Archimedes
• Pascal
• Bernoulli
• Einstein 

If you place an object in a fluid and it sinks which is true 

• its weight is less than the buoyant force
• the fluid is more dense than the object
• its weight  is greater than the buoyant force
• dead men tell no tales 

The buoyant force on an object equals 250 N. What is the weight of the displaced water?

• 250 N
• 250 lbs
• 250 N/9.8 m/sec²
• not enough information given

The upward force exerted by a fluid on a submerged object.

• gravity
• anti-gravity
• buoyant force
• lift