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Mechanics

Cool goIITian

 Joined: 19 Apr 2012 Post: 53
19 Apr 2012 16:31:15 IST
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Can the velocity of centre of mass change even if no work is being done on the system?
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Can the velocity of centre of mass change even if no work is being done on the system?

Forum Expert
Joined: 21 Jun 2011
Posts: 743
19 Apr 2012 17:21:33 IST
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velocity of centre of mass doesnot change until and unless an external force is applied to it . so i guess the answer would be a no

Cool goIITian

Joined: 19 Apr 2012
Posts: 53
19 Apr 2012 18:05:12 IST
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a book of mine says different ..The explanation given is, When a person acccelerates himself on a rough horizontal surface without any flipping betweeen his shoes and ground work done by friction, normal reaction and weight are all zero but COM changes. I dont get it

Blazing goIITian

Joined: 2 Mar 2012
Posts: 304
19 Apr 2012 18:47:58 IST
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## So, the velocity of centre of mass change even if no work is being done on  the system

Hot goIITian

Joined: 15 Apr 2012
Posts: 104
19 Apr 2012 19:16:52 IST
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in case of uniform circular motion,work done by force is zero.....but dirn.of velocity,is changing,and velocity is vector quantity,so velocity changes even if no work is done.........

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