Calculating Drag Force Constant in a Simple Physics Problem

In summary, the conversation discusses a question about modelling drag force and determining the value of a constant, C, using a formula with the variables R and v. The participants also discuss the use of F=ma to determine drag force and clarify that R is a force.
  • #1
azure.hubris
9
0
The first part of a pretty involved, 8 part question on modelling drag force states: "A 0.142 kg ball has a terminal speed of 42.5 m/s. If a ball experiences a drag force of R=CV^2, what is the value of the constant, C?

I know this is a ridiculusly easy problem, but our text doesn't cover the formula for drag force at all, and I'm not sure what the R variable is. I mean, I know that v is velocity, so you'd think by elimination, R must be somehow represent mass, but the answer that produces isn't accepted by the homework system. So, who wants to tell me what R is, and possibly make fun of my ignorance a little too? Any takers?
 
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  • #2
Use F = ma = drag force, with the left side determined by gravity's force, and the right side given by the drag force.

Don't worry about it being ridiculously easy. If that's your worst problem this semester you done good.

Carl
 
  • #3
The question tells you "a drag force of R=..."

That is, R is a force - a drag force.
 
  • #4
Okay, I see. Thanks for the assistance.
 

FAQ: Calculating Drag Force Constant in a Simple Physics Problem

1. What is drag force?

Drag force is a type of resistance that opposes the motion of an object through a fluid (such as air or water). It is caused by the friction between the fluid and the surface of the object.

2. How is drag force calculated?

The drag force on an object can be calculated using the formula Fd = 0.5 x ρ x v^2 x Cd x A, where ρ is the density of the fluid, v is the velocity of the object, Cd is the drag coefficient, and A is the reference area of the object.

3. What factors affect drag force?

The factors that affect drag force include the density and viscosity of the fluid, the velocity of the object, the shape and size of the object, and the roughness of its surface. These factors can also affect the drag coefficient and reference area of the object.

4. How does drag force impact an object's motion?

Drag force acts in the opposite direction of the object's motion, slowing it down and reducing its acceleration. This can be seen in sports such as car racing or skiing, where objects with less drag force are able to move faster.

5. How can drag force be reduced?

There are several ways to reduce drag force, such as streamlining the shape of the object, smoothing its surface, or using aerodynamic designs. These techniques can help to minimize the friction between the object and the fluid, reducing the drag force and allowing for faster motion.

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