Buoyancy-1

What is buoyant force?

• An upward force exerted by fluids on an object.
• An downward force exerted by fluids on an object.

What is the formula for density?

• density = mass x volume
• density = mass / volume
• density = mass + volume
• density = mass - volume

Which liquid is the least dense?

• oil
• water
• syrup 
• plastic bottle

The density of water is 1g/cm³. A substance will float if its density is less than that of water. Which of the following substance will float?

• substance 1
• substance 2
• substance 3
• substance 4

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

An object weighs 500 N.  It displaces 150 N of water.  While in water, the object's weight is

• 500 N
• 650 N
• .33 N
• 350 N

Tags

NGSS.MS-PS2-2

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.

Tags

NGSS.MS-PS2-4

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.

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