Work Equals Potential and Kinetic Energy - Clarification Needed

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Homework Help Overview

The discussion revolves around the relationship between work, potential energy (PE), and kinetic energy (KE) in the context of energy conversion and the effects of external forces such as friction.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the idea that work done is equal to changes in energy forms, questioning whether PE can equal KE directly. They discuss scenarios involving friction and external forces that complicate this relationship.

Discussion Status

The discussion is active, with participants raising questions about the conditions under which potential energy is converted to kinetic energy. Some guidance has been offered regarding the distinction between energy forms and the impact of external factors like friction.

Contextual Notes

Participants are considering specific scenarios, such as a box sliding down a hill with friction, which introduces complexity to the energy conversion discussion. There is an acknowledgment that assumptions about energy equality may not hold true in all cases.

moomoocow
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hi!

can i say that
when work is done, it is equal to potential energy, which is equal to kinetic energy?

can somebody please correct me if i misunderstood it?
 
Last edited:
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nah u can't say that.basically u can't even say PE is equal to KE its the change that is equal
 
when work is done energy is converted from one form to the other

the potentail energy may not necssarily equal the kinetic energy... what if there was friction or some other external force?
 
oo
so its the loss of potential energy which is equal to KE?
 
moomoocow said:
oo
so its the loss of potential energy which is equal to KE?

this is not always true

think of this:

suppose there was box on top of a hill. And the surface of the hill had friction. Then as the box slides down the hill what can you say about the kinetic energy gained by this box? Is it equal to the potnetial energy lost? Wh or Why not??
 
suppose u push a box on a frictionless surface, PE wrt the floor will always be zero but there is still some KE
 

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