How Can I Calculate Position z(t) from Velocity as a Function of Position?

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Homework Help Overview

The discussion revolves around calculating position z(t) from a velocity function that depends on position. The original poster describes a scenario involving force and acceleration, leading to a derived velocity function.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to relate acceleration and velocity through a derived equation, but expresses uncertainty about how to proceed to find z(t). Some participants question the choice of variables, particularly the use of 'y' instead of more conventional symbols like 's' for position.

Discussion Status

The discussion is ongoing, with participants exploring the implications of variable choice and the necessary steps to integrate velocity to find position. There is a suggestion that integrating velocity is a typical approach, but the need for a time-dependent function is noted.

Contextual Notes

There is a mention of confusion regarding variable representation, specifically the use of 'y' instead of 'z', which may affect clarity in the problem setup.

henryc09
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Homework Statement


I have a problem where I have a force and therefore acceleration which depends on position, z. Using z'' = dv/dt = dv/dy * dy/dt = v*dv/dy I was able to find velocity as a function of position.

It nows asks for z(t). I'm having a bit of a mental block here and don't know how to go about finding this. Any help would be appreciated!


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The Attempt at a Solution

 
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henryc09 said:

Homework Statement


I have a problem where I have a force and therefore acceleration which depends on position, z. Using z'' = dv/dt = dv/dy * dy/dt = v*dv/dy I was able to find velocity as a function of position.
I'm confused by your choice of variables in this problem. The usual variables that are used in problems of this type are s for position, v for velocity, and a for acceleration, where v = ds/dt, and a = dv/dt = d2s/dt2.

What does y represent in your problem?
henryc09 said:
It nows asks for z(t). I'm having a bit of a mental block here and don't know how to go about finding this. Any help would be appreciated!
 


sorry I messed that up, wherever I put y I meant z.

so i found v(z)
 


What do you have for v(z)? The usual thing to do with velocity to find position is to integrate, but for that you would need to integrate with respect to time, and v would have to be a function of t.
 

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