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11 Answers
62There important things in such questions...
1) The relationship between different tensions in the strings
2) The direction of tension (A lot of students mess up the direction of tension)
3) The relation ship between the acceleration of the different bodies involved. (This is teh most crucial step for all such problems)
4) The FBD
5) The Force Equations from newton's law
6) Solving these equations....
Try and answer each question one by one...
I will help you if you are wrong at each step..
11i remember this 1...i have done it before..its from irodov right ??
u will be able to do it seeing nishant sir's post or should i post the solution ??
3Eq for m2:
m2g - T=m2a1
eq for m1:
T-m1g=m1a2.
[m2 and m1 are having the same acceleration as they are connected with the same string]
for m:
2T=ma3
Sir I am having doubt with the eq of m!!!!!!!!
62There is a mistake...
for safety, always assume different accelerations a1, a2 and a3
then fidn the relation between them
Here you have assumed a1=-a2
which is not correct.. (Becasue we are using the ground frame fo reference)
3Sir I have edited the eqs.
acc of m1 --- a1
of m2--- a2
of m ---- a3.
Do we have to consider it in this way????
62m1 and m2 do not have the same acceleration...
btw what is confusing you is that they have the same accelaration with respect to the moving pulley.. not with respect to the ground...
62this is fine..
but you need to find a relationship between the accelearations using constraint relationship...
a1-a2=2a3 (That will be the result)