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![[Post New]](/templates/default/images/icon_minipost_new.gif) 5 Mar 2008 21:21:32 IST
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in a straight line motion what is the concept of a moving body being considered as a point object it will be better if one can explain with a example Rates assureds for satisfactory answers
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5 Mar 2008 21:23:45 IST
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hmm..
i guess it shud be becoz..wen taking displacement...if we do not consider a point object..we will hv different displacements for different parts of the body..and while taking the displacement..we will hv to take into account the length of the body too..like in case of a TRAIN..
the other thing is it wud be easier to work with pointed body coz force and thus acceleration acts on the centre of mass of the body..thats the only thing we consider for defing the motion of a body...
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5 Mar 2008 21:38:49 IST
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if the distance covered by body is large as compared to its own size then body is considered as point object.
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Devendra Kumar Shukla
M.Sc physical Chemistry
Currently working in Daswani classes |
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5 Mar 2008 21:47:16 IST
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look below boss, i screwed this !
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ameya s,
1 yr
iit bombay.
if you ever want to help me clean my room, go STUDY NOW!!! |
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5 Mar 2008 21:47:57 IST
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who says we have to take it as a point object?
all we have to consider is that the forces pass through its centre of mass, thats all.
and coming to an example, take the typical example of two trains crossing each other. take ANY DAMN POINT on the train and your answer wont change, though its always advisable take either extreme for easier analysis.
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ameya s,
1 yr
iit bombay.
if you ever want to help me clean my room, go STUDY NOW!!! |
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7 Mar 2008 20:35:55 IST
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so u r tellin me..that we dont need to take the length of the other train while calculating the time taken for a train to overtake the othe train?
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7 Mar 2008 21:04:30 IST
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Hey..if the problem doesnt mention the length of the body, you have to take it as point mass only na......
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"I a universe of atoms.......an atom in the universe" |
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