Understanding Fluid Resistance: The Relationship Between Drag Force and Objects

In summary, the force of drag on an object can be determined by using the formula Drag=1/2 CpAv^2, where C is the drag coefficient, p is the density of the fluid, and A is the effective cross sectional area of the object. This relationship is directly proportional to the square of the velocity of the object relative to the fluid. The constant of proportionality, represented by c, can be determined by fitting a set of data and is dependent on the specific fluid and object. It is important to research and utilize resources such as Google or Wikipedia before asking for a formula. Additionally, c should not be confused with the speed of light, as it is simply a constant used in the formula."
  • #1
itsjustme
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0
Is there any relationship (formula) that can determine the force of drag to an object. thanks in advance.
 
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  • #2
Drag is directly proportional to velocity squared. Hence Drag=C * V^2 where c is a constant and v is the velocity of the body relative to the fluid. The usual form is Drag=1/2 CpAv^2. Where C is the drag coefficient, p is the Greek letter rho representing the density of the fluid and A the effective cross sectional area.

Note: Before just asking for a formula try google or wikipedia in future.
 
  • #3
ok thanks hmm c, i have my doubts about it being the speed of light what constant is it?
 
  • #4
c would be the constant of proportionality. eg. if y directly varies with x then the relationship between y and x will be y=kx; Where k is a constant whose value is determined to fit a set of data.

http://www.purplemath.com/modules/variatn.htm

In the case above the constant will take the form 1/2 CpA which will be determined by the fluid and object.
 

FAQ: Understanding Fluid Resistance: The Relationship Between Drag Force and Objects

1. What is fluid resistance?

Fluid resistance is the force that opposes the motion of an object through a fluid, such as air or water. This force is caused by the friction between the fluid and the object's surface, and it increases as the speed of the object increases.

2. How is fluid resistance related to drag force?

Drag force is the component of fluid resistance that is parallel to the direction of motion of the object. In other words, it is the force that acts to slow down the object as it moves through the fluid. The magnitude of drag force is directly proportional to the object's speed and the density of the fluid, and it is also affected by the shape and size of the object.

3. What factors affect fluid resistance?

The main factors that affect fluid resistance are the speed of the object, the density of the fluid, and the shape and size of the object. Additionally, the viscosity (or thickness) of the fluid and the surface roughness of the object can also have an impact on fluid resistance.

4. How can fluid resistance be reduced?

There are a few ways to reduce fluid resistance, including changing the shape of the object to be more streamlined, using a smoother surface to decrease surface roughness, and decreasing the speed of the object. Additionally, using materials with lower viscosity, such as air instead of water, can also help reduce fluid resistance.

5. Why is understanding fluid resistance important?

Understanding fluid resistance is important in many fields, including aerodynamics, hydrodynamics, and sports science. It can help engineers design more efficient vehicles and structures, and it can also help athletes improve their performance by reducing drag. Additionally, understanding fluid resistance can also aid in predicting and mitigating the effects of natural disasters, such as hurricanes and tsunamis.

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