Understanding Conservative Forces in Physics

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Homework Help Overview

The discussion revolves around the concept of conservative forces in physics, particularly focusing on definitions and examples provided in a textbook. The original poster expresses confusion regarding the nature of conservative forces, specifically questioning the relationship between work, displacement, and the conditions under which forces are considered conservative.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to clarify the definition of conservative forces and their implications on work and energy. Some participants provide examples contrasting conservative and non-conservative forces, such as gravity and friction, to illustrate the concepts. Questions about the role of potential energy in relation to conservative forces are also raised.

Discussion Status

The discussion is ongoing, with various interpretations being explored. Some participants have offered examples and clarifications regarding the definitions and implications of conservative forces, while the original poster continues to seek a clearer understanding of the concepts presented in their textbook.

Contextual Notes

The original poster indicates difficulty in understanding textbook material and expresses frustration with the teaching approach. There is a noted lack of clarity in communication, which may contribute to the confusion surrounding the topic.

livelife92
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hiee...
ther r sum sentences in ma textbk dat i ve neva been able 2 understand...:confused:

"a force is said to be conservative if wrk done by the force in a moving body depends only in the initial n final positions of the body during the motion"
does it mean dat a force is conservative if wrk depends on displacement?...bt thn why IS it said 2 b CONSERVATIVE??

""this is always true when anybody is moved against the force of gravity ...weight is thus a CONSERVATIVE force""?!?:mad:

"KE and PE 2gthr make up the total mech E of an object'
...i knw dat...bt
'it remains constant if thr r no external forces 2 wrk on the body anddddd "THE INTERNAL FORCES ARE CONSERVATIVE""also thr shld be no sudden changes in the motion of d body:rolleyes:

pleasezzz help me! i m jus nt been able 2 undrstand this...the tchr. who teaches us phy. seems to mug up the text n throw up in frnt of us...she is totally confused when i ask this...
please help me undrstnd this
 
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Friction is an example of a non-conservative force... If you take a block of wood on a table and move it from position A to position B... the work done by friction depends on the path taken... do you go in a straight line... do you go in a curve... the work done by friction will be different depending on the path taken...

But for gravity the path doesn't matter... just the initial and final heights.

When you have a conservative force, you can have a "potential" energy... like gravitational potential energy... elastic potential energy... electric potential energy they make things easier because you don't have to deal with those forces... just energies...
 
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You seem to have a number of problems- extreme difficulty in writing a coherent sentence, for one, inability to understand that the "tutorial section" is not for questions- most people do not go to the tutorial section to answer questions!

I'm moving this to the homework thread where I hope you will get more responses.
 
ok sry...i wasnt careful while posting...newayz..i needed an ans 2 my Q..
 
livelife92 said:
ther r sum sentences in ma textbk dat i ve neva been able 2 understand...:confused:
ther r sum sentences in ur Q dat i can't undestnd eidr, prhps u cld try puttin in sum vowels 4 exmpl n use sum commas r dots r sumthn

livelife92 said:
"a force is said to be conservative if wrk done by the force in a moving body depends only in the initial n final positions of the body during the motion"
does it mean dat a force is conservative if wrk depends on displacement?
No... or yes!
It depends on the initial and final position, so the total displacement. It does not depend on the path taken. For example, gravitational force is conservative, because if I lift an object straight up by 1 meter, or I move it all over the world, to the center of the Earth and finally hold it 1 meter higher than I started, in both cases the work done will be m g (assuming g to be constant). On the other hand, friction is non-conservative. If I move from A to B in a straight line, I will lose less energy in friction then when I move in a lot of tiny circles, for example.

livelife92 said:
"KE and PE 2gthr make up the total mech E of an object'
'it remains constant if thr r no external forces 2 wrk on the body anddddd "THE INTERNAL FORCES ARE CONSERVATIVE""
Yeah, so actually PE is just a bookkeeping tool that allows us to (ab)use conservation of energy when conservative forces are at work.
 
thx!
 

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