Drag Force on a Streamlined Body

In summary, drag force on a streamlined body is the force that opposes its motion in a fluid, and is caused by friction and resistance of the fluid against the body's surface. It can be calculated using the formula F<sub>D</sub> = ½ρv²C<sub>D</sub>A, and is affected by factors such as body shape and size, fluid density and viscosity, and velocity. The drag force can significantly impact the motion of a body by slowing it down and increasing energy consumption. To reduce drag force, the body's shape and surface can be optimized, and the speed or density of the fluid can be altered.
  • #1
anhchangdeptra
8
0
Hi,

I know that the drag force on an object: Fd= 1/2 . ρ . v^2 . Cd . A

where A is the reference area.

But in the case of a streamlined body, I don't know what will be taken as the reference area. Should it be the largest cross-sectional area of the body?
 
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  • #2
Oh sorry, in this case I'm talking about drag force caused by air resistance
 
  • #3
Yes, the cross section area as seen from the direction of the wind
 

FAQ: Drag Force on a Streamlined Body

1. What is drag force on a streamlined body?

Drag force on a streamlined body is the force that acts in the opposite direction of the body's motion when it moves through a fluid, such as air or water. This force is caused by the friction and resistance of the fluid against the body's surface.

2. How is drag force calculated on a streamlined body?

The drag force on a streamlined body can be calculated using the formula FD = ½ρv²CDA, where ρ is the density of the fluid, v is the velocity of the body, CD is the drag coefficient, and A is the cross-sectional area of the body.

3. What factors affect the drag force on a streamlined body?

There are several factors that can affect the drag force on a streamlined body, including the shape and size of the body, the density and viscosity of the fluid, and the velocity at which the body is moving. The roughness of the body's surface and the presence of any obstacles in the fluid can also impact the drag force.

4. How does the drag force on a streamlined body impact its motion?

The drag force on a streamlined body can significantly affect its motion by slowing it down and reducing its acceleration. This can be particularly important for objects moving at high speeds, such as airplanes or cars, as the drag force can increase the amount of energy and fuel needed to maintain their motion.

5. How can the drag force on a streamlined body be reduced?

The drag force on a streamlined body can be reduced through various methods, such as changing the shape of the body to make it more aerodynamic, smoothing out any rough surfaces, and using materials with low drag coefficients. Additionally, reducing the speed or density of the fluid can also help decrease the drag force.

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