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Blocks being pulled by a string 
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#1
Mar2305, 06:47 AM

P: 7

I'm just starting to get my head around the concepts of Tension and Force but I'm stuck on this question, I was wondering if anyone could help me out?
Q: 3 identical blocks connected by ideal strings are being pulled along a horizontal frictionless surface by a horizontal force F. The magnitude of the tension in the string between blocks B and C is T. Assume that each block has mass m. i> What is the magnitude of the force? (Expressed in terms of T) ii> What is the magnitude of the accleration of the three blocks (in terms of m and F)? I worked out the acceleration on block B (T/(2*m)) but don't know what to do next. I'd really appreciate any help with this. 


#2
Mar2305, 06:51 AM

P: 20

The acceleration is the same for the entire system. So the force must be (m1 + m2 + m3)*a
hope that helps 


#3
Mar2305, 06:58 AM

P: 7

I think it does... that would make the Force 3/2*T right?
So in terms of m and F, the acceleration would be F/3m ? 


#4
Mar2305, 07:35 AM

P: 453

Blocks being pulled by a string
Yes, you are right.
[tex]F  T = m_ca[/tex], or [tex]F = T + m_ca = T + m(\frac{T}{2m}) = \frac{3}{2}T[/tex] 


#5
Mar2305, 08:00 AM

P: 7

Awesome  Thanks a lot



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