Flight Introduction: The Properties of Air

Air does not exert the same amount of ________ everywhere.

Answer explanation

Air does not exert the same amount of pressure everywhere. Air has a mass and exerts pressure downward due to gravity’s force, so the higher you go the less air there is above, therefore the lower the air pressure.

Tags

NGSS.MS-ESS2-5

You have probably felt a change in air pressure if you have ever been in a fast-moving elevator going up a tall building. The pressure of the air inside the elevator __________ the higher you climb; but the air pressure inside your body remains the same.

• stays the same

• decreases

• increases

• doesn't change

Answer explanation

You have probably felt a change in air pressure if you have ever been in a fast-moving elevator going up a tall building. The pressure of the air inside the elevator decreases the higher you climb; but the air pressure inside your body remains the same. This means the air pressure inside your body is higher than the air pressure in the elevator as you ascend.

This imbalance in pressure makes your eardrums bulge out slightly until some air forces its way out of your ears and you feel them “pop.” This happens because air tends to flow from areas of ________ pressure to areas of ___________ pressure.

Air pressure _________ as you descend due to more air molecules pressing down from above.

Answer explanation

Mass and weight are directly ________________; the greater an object’s mass the greater its weight. It is important to remember that air, although invisible, has mass.

Answer explanation

Tags

NGSS.MS-PS2-4

An object’s mass rarely changes, but an object’s weight does change depending on how strong the force of gravity is. The ______________ the force of gravity, the greater an object’s weight; the ______________ the force of gravity, the lower an object’s weight.

Answer explanation

An object’s mass rarely changes, but an object’s weight does change depending on how strong the force of gravity is. The stronger the force of gravity, the greater an object’s weight; the weaker the force of gravity, the lower an object’s weight. For example, on the moon, the force of gravity is 6 times less than that on Earth. Therefore, your weight on the moon is 1/6th of your weight on Earth. That means that if you weigh 120 lbs on Earth, you would weigh 20 lbs on the moon!

Weight is the ________

pressing force produced by the man’s mass due to the force of gravity

• downward

• upward

• parallel

• equal

Tags

NGSS.MS-PS2-4

Air tends to flow from areas of _____ pressure to areas of _____ pressure

Tags

NGSS.MS-ESS2-5

NGSS.MS-ESS2-6

The farther you go away from the surface of Earth, the __________ the air

pressure, since there is less air pressing down from above.

• lower

• higher

Air ________ _______ against all sides of everything it touches. It never stops ___________!

Tags

NGSS.MS-PS2-5