Buoyancy and Archimedes Principle

The ship was able to float in the water because its weight was the same as the weight of the water it displaced.

• True
• False

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

Tags

NGSS.MS-PS1-2

Hot air balloons float because hot air displaces cool air in the atmosphere.

• true
• false

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. 

Jack has a rock. The rock has a mass of 14g and a volume of 2cm³. What is the density of the rock?

• 7 mL
• 7 g/cm³
• 28 g/cm³
• 1/7 g/cm³

Tags

CCSS.7.RP.A.3

Jack has a large balloon filled with air and laying on a table in a classroom. The balloon and air have a mass of 1200g and a volume of 1 m³. Which statement about Jack's balloon is correct?

• The balloon will displace 1 cubic meter of air

• Each of the other three statements is correct.

• The balloon will displace less than 1200 grams of air

• The buoyant force on the balloon is equal to the weight of air displaced

A rock dropped into a glass of water raises the water level by 40 milliliters. What can you infer about the rock?

• It has a mass of 40 grams

• It has a desity of 40 grams per milliliter

• It has a volume of 40 milliliters

• It has a weight of 40 pounds

A tennis ball is placed in a bowl filled to the brim with water. Which of the following statements is true?

• The water that spills out weighs more than the ball

• The water that spills out has less volume than the ball

• The water that spills out weighs less than the ball

• Since the ball floats, no water spills out