Work that a man will do.

IIT JEE 2015 Online › Mechanics questions › Work that a man will do.

A man pushes a compartment of a train in the direction in which the train is accelerating uniformly. Will the man do +ve ,-ve or no work ?

#Physics #Mechanics

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Ð”Ð²Ò¥Ñ—ÑuÏ now in medical c ·2009-02-12 23:13:08

is n't it no work if inside the train[7]??

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Lokesh Verma ·2009-02-12 23:42:52

no it is not 0 work if he is inside the train.

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Grandmaster ·2009-02-12 23:53:02

but then nishant bahiya , isn't the same friction and reaction force acting on the man and hence +ve work is done tby the train on man and hence

the energy of the system is unchanged and in accordance to the statement

"internal forces do not change the energy of the system

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Ð”Ð²Ò¥Ñ—ÑuÏ now in medical c ·2009-02-13 00:02:01

what work will be done if he is inside??[7]

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Grandmaster ·2009-02-13 00:07:51

the work done will be f_netx(displacement)

f_net=frictoin (on man)-normal reaction by train wall (on man)

diplacement is fixed =at²

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