Understanding Conservative Forces in Physics

In summary: This is always true when anybody is moved against the force of gravity ...weight is thus a CONSERVATIVE force."?!?:mad:
  • #1
livelife92
6
0
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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  • #2
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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  • #3
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.
 
  • #4
ok sry...i wasnt careful while posting...newayz..i needed an ans 2 my Q..
 
  • #5
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.
 
  • #6
thx!
 

Related to Understanding Conservative Forces in Physics

1. What are conservative forces in physics?

Conservative forces are those that do not dissipate energy and can be described by a potential function. This means that the work done by these forces is independent of the path taken and only depends on the initial and final positions of the object.

2. How are conservative forces different from non-conservative forces?

Unlike conservative forces, non-conservative forces do dissipate energy and cannot be described by a potential function. This means that the work done by these forces is path-dependent and can also depend on other factors such as velocity and time.

3. What are some examples of conservative forces?

Some examples of conservative forces include gravity, electric forces, and magnetic forces. These forces act on objects without causing them to lose energy, and their effects can be described by potential energy functions.

4. How can I identify if a force is conservative or non-conservative?

A simple way to identify if a force is conservative is to check if it can be described by a potential energy function. If the work done by the force is independent of the path taken, then it is a conservative force. If the work done is path-dependent, then it is a non-conservative force.

5. What are the practical applications of understanding conservative forces in physics?

Understanding conservative forces is crucial for many areas of physics and engineering. It allows us to accurately predict the motion of objects and design systems that conserve energy. For example, knowledge of conservative forces is essential in designing efficient machines and understanding the behavior of celestial bodies in space.

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