- #1
-Physician
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Homework Statement
In formula of air friction ##f_{air}=-bv##
v is velocity but what's b?
-Physician said:In this formula v is not squared. but if b is coefficient, how would we win Newton for friction
coefficient =0.3 (example)
v=3m/s
##f_{air}=-bv=(-0.3)(3m/s)## gives us m/s , but not Newton?
gneill said:Replace all the variables that you know the units for with their units (so for example v → m/s, f → N). Solve the resulting expression for the "unknown" variable. In this case solve for b. You should have b on the left and its units on the right.
LawrenceC said:In your formula, b would be a coefficient that includes things like drag coefficient, air density, and frontal image area. Usually though, the force is represented by v^2, not simply v. [PLAIN]http://www.vvio.info/jpg1[/QUOTE]
In your formula, b would be a coefficient that includes things like drag coefficient
shiliangtu said:In your formula, b would be a coefficient that includes things like drag coefficient
shiliangtu said:In your formula, b would be a coefficient that includes things like drag coefficient
-Physician said:If that would be mass divided by time , then we would have
##f=\frac{mv}{t}##, but that's the force formula, even friction is a kind of force, would that be friction's formula as well?
-Physician said:By that I understand that none answered my question, what is b , just simply and what is it equal to?
It looks like there have been some very good posts here, but you don't like the answers.-Physician said:By that I understand that none answered my question, what is b , just simply and what is it equal to?
Air friction, also known as air resistance, is the force that opposes the motion of an object through the air. It is caused by the collision of air molecules with the surface of the object.
'b' represents the drag coefficient, which is a measure of how easily an object can move through the air. It takes into account the size, shape, and surface properties of the object.
Air friction acts in the opposite direction of the object's motion, reducing its speed and acceleration. As the object moves faster, the force of air friction increases, eventually reaching a point where it is equal to the object's weight, resulting in a constant velocity known as terminal velocity.
No, it is impossible to completely eliminate air friction. However, its effects can be reduced by changing the shape and surface properties of an object, as well as by reducing its speed.
Air friction is unique because it depends on the speed and shape of the object, whereas other forms of friction, such as sliding friction, are independent of these factors. Additionally, air friction only occurs when an object is moving through the air, while other forms of friction can occur between any two surfaces in contact.