This should be cake...
A brick is kept on a rough inclined plane. Consider the net normal reactions on part A and B of the brick to be 'N' and 'N*'. (A and B are two equal portions)
Then
a)N > N*
b)N < N*
c)N = N*
d)We need the angle of the plane and coeff. of friction to comment...
Anyone interested?? Plz post only the option..not the soln..
This should be fun!
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ReplyDeleteyup..
ReplyDeleteThis comment has been removed by the author.
ReplyDeleteN = N*
ReplyDeletegoyal saab..you're missing something!!!
ReplyDeletebhaiya plz tell is ans c
ReplyDeleteb
ReplyDeleteN < N* to balance torques
ReplyDeleteN < N* to balance torques
ReplyDeleteSo you got it.. the friction produces a clockwise torque which must be balanced by an anticlock. torque..obviously due to non-uniformity of normal reaction!
ReplyDeleteya its b only made a little mistake
ReplyDeletedammit man
whatsay for a smooth plane??
ReplyDeletebhaiya cant we get the ans without balancing the torque
ReplyDeleteplz tell
i think than it will be c in case of a smooth plane
ReplyDeleteC for smooth plane
ReplyDeletetrue.
ReplyDeletei cant understand the explanation of option b please explain it sir
ReplyDeletehere there is friction for both blocks then why option B
ReplyDeletewait fr bhaiya to post soln
ReplyDeletethis is how i did it
first i analyzed the body as a whole,balanced torques,got that "net" normal force acts on the body somewhere at lower part
PS : "net" normal force is a group of many normal forces acting at evry point in contact with plane
@rohan
ReplyDeletedon't consider it to be 2 blocks it is 1solid brick. so friction is acting producing a torque. now normal rxn will shift towards B to balance it.
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ReplyDeletetherefore is NORMAL REACTION ON BLOCK A IS ZERO??????????????????
ReplyDeleteThis comment has been removed by the author.
ReplyDeleteplease reply yaar!!!!!!!!!
ReplyDeleteno yaar
ReplyDeleteactually the arrow which we show in the diagram is the resultant of all the small arrows.(vectors)
but when they have to balance the torque their net magnitude though remain the same but their distribution on the 2 sides decrease.
I dont clearly remember but physics sir in a class of LAWS OF MOTION madu us do a question of toppling. In that he drew the small normal reaction arrows whose magnitude were constantly changing.
may i add??
ReplyDeleteThe resultant of a number of forces is a force with the following properties:
1)Its magnitude is equal to the resultant magnitude of all the forces involved.
2)Its torque abt. any pt. in the universe is the resultant torque of all forces.