# Basic Principles Of Aerodynamics! Quiz

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Solid objects like airplanes and birds fly perfectly in the air because they obey the laws of aerodynamics. Do you already know this? Aerodynamics is a new knowledge of the interaction between solid objects flying and the air. This scientific concept is closely associated with fluid mechanics and gas mechanics. Let's take a quiz!

• 1.

### When were the Euler equations of aerodynamics published?

• A.

1735

• B.

1757

• C.

1744

• D.

1771

B. 1757
Explanation
The Euler equations of aerodynamics were published in 1757.

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• 2.

### What is Bernoulli's principle used to calculate?

• A.

Density

• B.

Thrust

• C.

Aerodynamic lift

• D.

Flow velocity

C. Aerodynamic lift
Explanation
Bernoulli's principle is used to calculate aerodynamic lift. This principle states that as the speed of a fluid (such as air) increases, its pressure decreases. In the context of aerodynamics, this principle explains how the difference in air pressure between the top and bottom of an airplane wing generates lift, allowing the aircraft to stay in the air. This principle is fundamental in understanding the physics of flight and is widely applied in the design and analysis of aircraft.

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• 3.

### Which of these aerodynamic quantities is not related to Hydrodynamica?

• A.

Density

• B.

Thrust

• C.

Pressure

• D.

Flow velocity

B. Thrust
Explanation
Thrust is not related to Hydrodynamica. Hydrodynamica is the study of fluids in motion, specifically water, and how they behave under different conditions. Density, pressure, and flow velocity are all important quantities in hydrodynamics as they help determine the behavior of fluids. However, thrust is a force that propels an object forward and is more related to aerodynamics, specifically in the context of propulsion systems like jet engines or rockets.

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• 4.

### How many are the forces of flight?

• A.

Four

• B.

Seven

• C.

Nine

• D.

Five

A. Four
Explanation
The forces of flight are four: lift, weight (or gravity), thrust, and drag. Lift is the force that opposes weight and allows an aircraft to stay in the air. Weight is the force exerted by gravity on the aircraft. Thrust is the force that propels the aircraft forward. Drag is the resistance encountered by the aircraft as it moves through the air. These four forces work together to enable flight.

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• 5.

### Who was the first person to identify the four aerodynamic forces of flight?

• A.

Leonhard Euler

• B.

Isaac Newton

• C.

George Cayley

• D.

Robert Kiyosaki

C. George Cayley
Explanation
George Cayley is credited with being the first person to identify the four aerodynamic forces of flight. Cayley, an English engineer and inventor, conducted extensive experiments and observations on the principles of flight. He recognized that lift, weight, thrust, and drag were the four fundamental forces that act on an aircraft during flight. Cayley's work laid the foundation for modern aviation and his insights were crucial in the development of the first successful gliders and airplanes.

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• 6.

### Which of these is not an aerodynamic force of flight?

• A.

Weight

• B.

Gravity

• C.

Drag

• D.

Lift

B. Gravity
Explanation
Gravity is not an aerodynamic force of flight. While weight is influenced by gravity, it is not considered an aerodynamic force. Aerodynamic forces of flight include lift, drag, and thrust. Lift is the force that opposes gravity and allows an aircraft to stay airborne, while drag is the force that opposes the forward motion of the aircraft. Thrust is the force that propels the aircraft forward. Gravity, on the other hand, is the force that pulls objects towards the center of the Earth and affects the weight of the aircraft.

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• 7.

### When were the forces of flight first identified?

• A.

1788

• B.

1799

• C.

1782

• D.

1719

B. 1799
Explanation
The forces of flight were first identified in 1799.

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• 8.

### Who constructed the first wind tunnel?

• A.

Charles Renard

• B.

Richard Best

• C.

George Cayley

• D.

Francis Wenham

D. Francis Wenham
Explanation
Francis Wenham is credited with constructing the first wind tunnel. A wind tunnel is a device used to study the effects of airflow over different objects. Wenham's wind tunnel, built in 1871, consisted of a long wooden box with a fan at one end to generate airflow. This allowed him to conduct experiments and gather data on the aerodynamics of different shapes and designs. Wenham's work laid the foundation for further advancements in aviation and engineering.

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• 9.

### When was the first wind tunnel constructed?

• A.

1879

• B.

1871

• C.

1899

• D.

1839

B. 1871
Explanation
The correct answer is 1871. This means that the first wind tunnel was constructed in 1871.

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• 10.

### How many aerodynamicists developed drag theories?

• A.

Three

• B.

Seven

• C.

Two

• D.

Four

A. Three
Explanation
Three aerodynamicists developed drag theories.

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• Current Version
• Mar 21, 2023
Quiz Edited by
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• May 18, 2019
Quiz Created by
Gregorynaomi

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