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Tension between 2 blocks and friction. 
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#1
Sep2108, 08:18 PM

P: 58

1. The problem statement, all variables and given/known data
A block of mass m1 = 2 kg and a block of mass m2 = 3 kg are tied together and are pulled from rest across the floor by a force of P = 25 N. The coefficient of friction of the blocks with the floor is µ = 0.14. I found the acceleration to be 3.6266 m/s^{2}. I need to find the tension in the string between the blocks. 2. Relevant equations F=ma and F_{f}=u(mg) 3. The attempt at a solution The total frictional force is 6.867 N. m1 has a frictional force of 2.7468 i think, and m2 has a frictional force of 6.7596 i think. I think the pulling force on m1 is 7.2532 N. I mean, i tried creating different summations of the forces, but I don't know what I'm doing wrong. I'm sure I could figure it out, but I need to at least know how to add the forces up in each direction. Thanks so much. 


#2
Sep2208, 10:59 AM

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#3
Sep2208, 08:50 PM

P: 58

okay, I typed the wrong number in for m2's frictional force. I meant to type in 4.1202 N. I arrived at m1's pulling force by (2)(3.6) = F. Right, I thought I tried creating a FBD but for some reason I'm doing something wrong. Is the acceleration on block m1 = 2.25 m/s2? At this point I am not sure what I am supposed to do.
EDIT: wait, doesn't the acceleration have to be equal to 3.6m/s2? 


#4
Sep2208, 11:27 PM

P: 58

Tension between 2 blocks and friction.
Hey, if someone could help me. I'm really stuck on this one, I just think I've dug myself a deeper hole trying to work this out. I would really appreciate any more help.
EDIT: I solved it. it's 10 N... 


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