Properties of Air & Forces of Flight

Why is air considered matter?

• It is invisible but has no physical properties.
• It is composed of gases, water vapour, and substances.
• It has mass and takes up space.
• It allows odour particles to travel in the environment.

How does air contribute to flight?

• It supports only mechanical flight, such as airplanes.
• It is only necessary for animals that fly.
• It provides the medium through which both animals and machines achieve flight.
• It prevents drones from falling to the ground.

How are odours detected through air?

• The eyes sense changes in air composition.
• Substances release particles that travel in the air, which are detected by receptors in the nose.
• Odour molecules emit visible signals that allow the body to sense them.
• Air molecules amplify odour, making them noticeable.

Which property of air is demonstrated when you inflate a balloon?

• Air takes up space.
• Air has mass.
• Air is made of gases.
• Air exerts pressure.

How can we show that air has mass?

• By feeling it in a breeze.
• By weighing a balloon filled with air.
• By observing it expand when heated.
• By watching leaves move in the wind.

What property of air is seen when a syringe is compressed with its nozzle blocked?

• Air moves.
• Air is made of gases.
• Air can expand and compress.
• Air has mass.

Why does air exert pressure?

• Because it flows from high to low pressure.
• Because its molecules are stationary.
• Because air molecules push against surfaces.
• Because air takes up space.

What is the primary composition of air?

• Only oxygen and carbon dioxide.
• Mostly nitrogen, oxygen, and other trace gases.
• Only hydrogen and nitrogen.
• Only oxygen and nitrogen.

Which property of air is responsible for creating wind?

• Air has mass.
• Air is made of gases.
• Air can expand and compress.
• Air moves.

What force of flight helps an airplane stay in the air by counteracting gravity?

• Drag
• Thrust
• Lift
• Weight