Force vector on falling object to determine terminal velocity and to graph it

In summary, you were given the equations k:constant, v:velocity, m:mass, and g:gravity. For part (a), you correctly used the equation F=ma. For part (b), the equation Vt= √(2mg/CρA) is not relevant and you should use FR=-kv instead. For part (c), you can either sketch or calculate the graphs to show how the force and velocity change with time.
  • #1
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Homework Statement



ScreenShot2011-12-03at11613PM.png

k: constant
v: velocity
m: mass
g: gravity
View attachment qw.pdf

Homework Equations



Vt= √(2mg/CρA)
F=ma

The Attempt at a Solution


part a.
ScreenShot2011-12-03at11640PM.png

View attachment w.pdf
part b.
ScreenShot2011-12-03at11518PM.png

View attachment b.pdf
I do not know if i am doing this right and i do not understand how to do part c. If you know how to do this please explain
 
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  • #2
Welcome to the forum! You've got part (a) correct.

But for part (b), I don't think the equation Vt= √(2mg/CρA) is relevant. You were explicitly given that FR=-kv, so this is the equation you should be using. In fact, I think you got the answer for (b), before you started using that other equation for the terminal velocity.

Part (c) is a bit trickier. You could either roughly draw what happens, or explicitly calculate the form of the graphs, then draw them.
 

FAQ: Force vector on falling object to determine terminal velocity and to graph it

1. What is a force vector and how does it affect a falling object?

A force vector is a graphical representation of the direction and magnitude of a force acting on an object. In the case of a falling object, the force vector is typically pointed downwards, indicating the force of gravity pulling the object towards the ground. This force, along with other factors such as air resistance, affects the acceleration and velocity of the object as it falls.

2. How can the force vector be used to determine the terminal velocity of a falling object?

The terminal velocity of a falling object is the maximum velocity it can reach while falling, when the force of gravity is balanced by the force of air resistance. By analyzing the force vector of a falling object and considering the forces acting on it, we can determine when these forces are balanced and therefore calculate the terminal velocity of the object.

3. What is the process for graphing the force vector and determining terminal velocity?

To graph the force vector of a falling object, we first plot the magnitude and direction of all the forces acting on the object. This includes the force of gravity, air resistance, and any other external forces. By analyzing the forces and their effects on the object's acceleration, we can determine the point at which the forces are balanced and the object has reached its terminal velocity.

4. How does air resistance affect the force vector and the determination of terminal velocity?

Air resistance is a force that opposes the motion of a falling object. As an object falls, it experiences an increasing amount of air resistance, which slows down its acceleration. This means that the force vector of air resistance becomes larger as the object falls. At terminal velocity, the force of air resistance is equal to the force of gravity, resulting in a balanced force vector and a constant velocity for the falling object.

5. What are some factors that can affect the force vector and the determination of terminal velocity?

Aside from the force of gravity, the main factor that affects the force vector and determination of terminal velocity is air resistance. The shape, size, and mass of the falling object can also play a role in determining the force vector and terminal velocity. Additionally, external factors such as wind and air pressure can also affect the force vector and the object's acceleration and velocity.

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