Sci 8 Chapter 4 Lessons 1-2 Check-in

Gases and liquids are both what? 

• Fluid

• Dense

• Pressure

• Solid

Tags

NGSS.MS-PS3-4

What pressure does 50,000 N of water apply to a surface area of 

0.25 m2 of coral?

• 1. 12,500 Pa

• 1. 12,500 N

• 1. 200,000 Pa

• 1. 200,000 N

The density of an object depends on what two things? 

• 1. Size and weight

• 1. Solid and liquid

• 1. Mass and distance

• 1. Mass and volume

What fluid has a stronger buoyant force: 

water or air? 

• Water

• Air

Why does water have a stronger buoyant force than air? 

• Water is more dense than air.  

• Water is less dense than air.  

Ice floats in water. 

Which must be true?

• 1. Ice molecules have more mass than water molecules. 

• 1. Ice molecules have less mass than water molecules. 

• 1. A volume of ice has less mass than the same volume of water. 

• 1. One gram of ice has less volume than 1g of water. 

One person walks 5 m down a hill. Another dives 5 m in a pool. Which feels a greater pressure increase?

• The person on the hill.

• The person in the pool.

Why does the person in the pool feel a greater pressure increase?

• Water is more dense than air.

• Air is more dense than water.

How does the buoyant force on an object relate to the weight of the fluid that the object displaces? 

• 1. They are equal.

• 1. The weight of the displaced fluid is greater. 

• 1. The buoyant force is greater. 

What is the buoyant force on you if you displace 400 N of water as you dive into the water? 

• 1. 400 N

• 1. 400 Pa

• 1. Not enough information.