M8.3 Steady-state flight

In equilibrium, what is the relationship between lift and weight?

• Lift is greater than weight.

• Lift is less than weight.

• Lift equals weight.

• Lift is unrelated to weight.

What is the sum of the vertical forces in equilibrium?

• Greater than zero

• Less than zero

• Zero

• Unrelated to zero

What is the sum of the horizontal forces in equilibrium?

• Greater than zero

• Less than zero

• Zero

• Unrelated to zero

What is the product of lift and the distance between the Centre of Gravity (CG) and the Centre of Pressure (CP) known as?

• Drag force

• Pitching moment

• Thrust force

• Lift coefficient

What changes with the angle of attack affecting the pitching moment?

• The aircraft's color

• The lift force and the position of the centre of pressure (CP)

• The aircraft's altitude

• The engine power

What happens to the lift when the angle of attack is increased beyond the critical angle?

• Lift becomes unrelated to the angle of attack.

• Lift remains constant.

• Lift decreases and the aircraft stalls.

• Lift increases indefinitely.

In equilibrium, what is the relationship between thrust and drag?

• Thrust equals drag.

• Thrust is less than drag.

• Thrust is unrelated to drag.

• Thrust is greater than drag.

What is the effect of increasing the angle of attack on the lift coefficient before reaching the critical angle?

• The lift coefficient decreases.

• The lift coefficient increases.

• The lift coefficient remains constant.

• The lift coefficient becomes zero.

In equilibrium, what is the relationship between the sum of moments about the center of gravity?

• Unrelated to zero

• Zero

• Less than zero

• Greater than zero

What happens to the drag force when the speed of the aircraft increases?

• Drag force remains constant.

• Drag force decreases.

• Drag force becomes zero.

• Drag force increases.