Lesson 17 Flight and Floating

What describes this shape

• Airway

• Aerofoil ( Airfoil )

• Aeron

• Airflow

When a plane is in flight, what's the main difference between the air below and above its wings?

• The air above the wings has lower pressure

• The air above the wings has a higher temperature

• The air below the wings has lower pressure

• The air below the wings has a higher pressure

What force provides aeroplanes upward force

• Thrust

• Drag

• Gravity

• Lift

These two forces need to overcome their opposite force in order for an aircraft to fly

• Drag & Gravity

• Lift & Drag

• Thrust & Gravity

• Lift & Thrust

When an aeroplane is taking off, lift is ____ gravity

• greater than

• less than

• equal to

What is required for an object to float in a fluid ?

• Have greater overall density than the fluid

• Have lower overall density than the fluid

• Be lighter than the fluid

• Be heavier than the fluid

What principle describes the buoyancy of an object

• Archimedes'

• Bernoulli's

• Newton's

• Boltzmann's

For an object to float the gravitational force needs to be ____ buoyant force

• less than

• greater than

• equal to

• none of the above

Why can a blimp float in air?

• It uses propellors to induce lift

• It reduces the overall density using less dense gas

• It increases the overall density using denser gas

What situation will allow for a bowling ball and a feather to fall at the same rate?

• In water

• In air

• In vacuum

• They never do