Theory of Flight

What is Lift?

• A vertical force that acts upward.

• The downward force, which tends to draw all bodies vertically towards the center of the earth.

• The force that creates the forward motion of the airplane.

• The resistance an airplane experiences moving forward through the air.

What is drag?

• The force that creates the forward motion of the airplane.

• The downward force, which tends to draw all bodies vertically towards the center of the earth.

• A vertical force that acts upward.

• The resistance an airplane experiences moving forward through the air.

What is weight?

• The resistance an airplane experiences moving forward through the air.

• A vertical force that acts upward.

• The downward force, which tends to draw all bodies vertically towards the center of the earth.

• The force that creates the forward motion of the airplane.

What is Thrust?

• The downward force, which tends to draw all bodies vertically towards the center of the earth.

• The force that creates the forward motion of the airplane.

• The resistance an airplane experiences moving forward through the air.

• A vertical force that acts upward.

An increase of thrust increases the effect of lift and drag but decreases the effect of weight.

• True

• False

An increase in weight decreases the effect of lift, thrust but decreases drag.

• True

• False

Lift and thrust are the positive forces (+), while weight and drag are the negative (-) forces.

• True

• False

A decrease in weight increases the effect of lift, drag, and thrust.

• True

• False

•Lift equals drag and weight equals thrust.

• True

• False

A decrease of thrust decreases the effect of lift and drag but increases the effect of weight.

• True

• False