Aviation 101 - The Air and the Forces

Front

What is the force that makes an airplane fly through the air?

Back

Lift

Answer explanation

The force that lifts an airplane into the air is called lift. It is generated by the wings as air flows over and under them, creating a pressure difference that allows the airplane to rise against gravity.

Front

According to Bernoulli's principle, what happens to the air pressure when the air moves faster?

Back

It decreases

Answer explanation

According to Bernoulli's principle, as the speed of air increases, the pressure decreases. This is because faster-moving air has lower pressure compared to slower-moving air, making 'It decreases' the correct answer.

Front

The main force that pulls an aircraft down toward the ground is:

Back

Weight

Answer explanation

The main force pulling an aircraft down is weight, which is the force of gravity acting on the aircraft. Lift opposes weight, while thrust and drag are related to forward motion and resistance, respectively.

Front

The force that pushes an aircraft forward is:

Back

Thrust

Answer explanation

The force that pushes an aircraft forward is called thrust. It is generated by the engines and is essential for overcoming drag and achieving forward motion, unlike lift, weight, and drag which serve different functions.

Front

When a plane is flying straight and level, the force of lift is equal to the force of:

Back

Weight

Answer explanation

When a plane is flying straight and level, the lift generated must counteract the weight of the plane. Therefore, the force of lift is equal to the force of weight, ensuring the plane remains in stable flight.

Front

The air flowing over the top of a wing moves faster than the air below it, which creates:

Back

Low pressure on top of the wing

Answer explanation

The air moves faster over the top of the wing, creating low pressure there due to Bernoulli's principle. This pressure difference generates lift, making 'Low pressure on top of the wing' the correct answer.

Front

What force holds an aircraft back and slows it down as it moves through the air?

Back

Drag

Answer explanation

As an aircraft moves through the air, drag is the force that opposes its motion, slowing it down. Lift helps it rise, thrust propels it forward, and gravity pulls it down, but drag specifically holds it back.

Front

What part of an airplane is specially shaped to create lift?

Back

The wings

Answer explanation

The wings of an airplane are specially shaped to create lift. Their design allows air to flow faster over the top surface than the bottom, generating a pressure difference that lifts the plane into the air.

Front

When an airplane is flying straight, what force must be equal to the force of drag?

Back

Thrust

Answer explanation

When an airplane is flying straight, the force of thrust must equal the force of drag to maintain a constant speed. Lift counteracts weight, but thrust is the force that propels the airplane forward against drag.

Front

When a plane takes off, it uses flaps on its wings to create more:

Back

Drag

Answer explanation

When a plane takes off, the flaps increase the surface area of the wings, which enhances lift but also increases drag. This drag is necessary for controlling the aircraft during takeoff.