How Does Force Affect Object Speed and Position?

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Homework Help Overview

The discussion revolves around a physics problem involving the effects of force on the speed and position of an object. The object in question has a specified mass, initial speed, and position, with the goal of determining its speed at a different position and the position at which it reaches a specific speed.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the use of kinetic energy and work done by force to analyze the problem. Questions arise regarding the relevance of kinetic energy in finding velocity and position, as well as how to approach the calculations involved.

Discussion Status

Some participants have suggested starting with the initial kinetic energy and considering the work done by the force as the object moves. There is an ongoing exploration of how these concepts relate to the problem's requirements, with no clear consensus on the next steps yet.

Contextual Notes

The original poster expresses confusion about how to begin solving the problem, indicating a potential gap in understanding the application of the relevant equations. There are also hints of specific conditions or constraints related to the problem setup that may need clarification.

matt@USA
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Homework Statement



The force shown in the figure acts on a 1.7kg- object whose initial speed is 0.44m/s and initial position is x=.27m. Find the speed of the object when it is at the location x=.99m. At what location would the object's speed be 0.32m/s ?



Homework Equations


I know that W=Fd. K=1/2mv^2. Vf^2=Vi^2+2ad.



The Attempt at a Solution


I have no clue where to start. I am completely lost. Where do, or how do I begin? Thanks for the help!
 

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compute the initial KE, at its initial location.
That KE is changed by the F.d , as it moves along:
(.8N)(.23m) extra as it crosses the 0.5m mark. etc.
 
Ok, so how does finding the Joules help me solve for velocity and location?
 
the KE contains all the info to find out how fast it's going. (½mv.v)
it's about KE _at_ a location , just like it used to be "velocity at a time"

Notice that they ask "where was it going slower than at 0.27m?"
 

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