How Flight is Possible

Question 1

Lift, thrust, drag, and gravity are

Accepted Answer

forces involved in flight.

Question 2

Gravity is a force that works the opposite of

Accepted Answer

lift

Question 3

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

Accepted Answer

smaller at the back than at the front.

Question 4

The wings of birds and planes are ___ on top.

Accepted Answer

curved

Question 5

Choose the incorrect answer.

Accepted Answer

incorrect, incorrect

Question 6

The article suggests that flight is possible mainly because of

Accepted Answer

thrust and body structure.

Question 7

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

Accepted Answer

lift.

Question 8

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

Accepted Answer

changing directions.

Question 9

Thrust is a force that acts opposite to

Accepted Answer

drag.

Question 10

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

Accepted Answer

thrust.

Question 11

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 12

Birds bodies are lightweight partly because they have many

Accepted Answer

hollow bones.

Question 13

You can infer that the largest airplanes need to have

Accepted Answer

very powerful engines.

Questions 13