How Flight is Possible

Question 1

You can infer that the largest airplanes need to have

Accepted Answer

very powerful engines.

Question 2

You can conclude from the article that without a tail, a bird or plane would have trouble

Accepted Answer

changing directions.

Question 3

Choose the incorrect answer.

Accepted Answer

incorrect, incorrect

Question 4

A force that pulls birds and planes upward as air flows past wings is

Accepted Answer

lift.

Question 5

Birds bodies are lightweight partly because they have many

Accepted Answer

hollow bones.

Question 6

Gravity is a force that works the opposite of

Accepted Answer

lift

Question 7

The flapping wings of a bird and the engine of a plane both produce

Accepted Answer

thrust.

Question 8

Although a bird needs only to flap its wings to fly, a plane needs an engine to provide thrust

Accepted Answer

because it is not lightweight.

Question 9

You can infer that a "tapered body" means a body that is

Accepted Answer

smaller at the back than at the front.

Question 10

The article suggests that flight is possible mainly because of

Accepted Answer

thrust and body structure.

Question 11

Thrust is a force that acts opposite to

Accepted Answer

drag.

Question 12

Lift, thrust, drag, and gravity are

Accepted Answer

forces involved in flight.

Question 13

The wings of birds and planes are ___ on top.

Accepted Answer

curved

Questions 13