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`        Find the acceleration of mass M in the situation of figure. The coefficient of friction between the two blocks is µ1 and that between the bigger block and the ground is µ2.`
7 years ago

147 Points
```										dear jayesh
let normal reaction between two block is N1 ,and the normal reaction between biggger block and ground in N2
for smaller block
so mg - T -μ1N1 =m2a.....1
N1=ma .............2
for bigger block
N2 =Mg +μ1N1 +T
or  N2=Mg + mg-2ma (from equation 1).......3
and  T +T -N1 -μ2N2=Ma
2T -ma -μ2(Mg +mg-2ma) =Ma ........4
put value of T from equation 1
2(mg -μ1ma-2ma) -ma -μ2(Mg +mg-2ma) =Ma
solve for a
Please feel free to post as many doubts on our discussion forum as you can. If you find any question Difficult to understand - post it here and we will get you the

```
7 years ago
Faraz Nassar
11 Points
```										Why is N2= mg +u1N1 + T as u1N1 and T are in opposite direction to Mg? And why did we take 2T in the equation of M?
```
one year ago
Vineeth Chennabhoina
14 Points
```										N2 is the normal reaction force on the bigger block, it’s equal to the sum of it’s own weight, and u1N1 because the smaller as the smaller body goes down, it rubs against the bigger body, and the friction between them is u1 and the Normal reaction between them is due to the weight of the smaller body. And T because, do you see the upper pulley attached to the bigger body, that’s causing a tension T on the body. And we’ve taken 2T in the equation because there’s two sets of ropes that have tention T in them, the top and the bottom, the vertical rope doesn’t have tension in it. That’s why we’ve taken 2T. I hope that clarifies your doubts Faraz.
```
10 months ago
shubham choubey
26 Points
```										How do we know that smaller block have 2a accl. And bigger block have a accl.??? Since it is not given in question...
```
6 months ago
Soumyajit Bagchi
14 Points
```										we can assume that the bigger block is moving with acceleration a then the smaller block will fall with 2a acceleration as when the bigger block moves a distance d the lower ripe length reduces by d and the small block falls d and also the upper pulley is connected with the bigger block thus the upper rope also reduces by d and the block again has a fall of d thus, a displacement of d in the bigger block has a displacement of 2d in the smaller block....and thus calculating you can see why while the upper block has acceleration of a and the smaller block an acceleration of 2a.
```
6 days ago
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