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Tension between 3 blocks 
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#1
Oct3108, 09:21 PM

P: 36

1. The problem statement, all variables and given/known data
Three identical blocks connected by ideal strings are being pulled along a horizontal frictionless surface by a horizontal force F_vec. (Intro 1 figure) The magnitude of the tension in the string between blocks B and C is T = 3.00 N. Assume that each block has mass m = 0.400 kg What is the magnitude F of the force? What is the tension T:AB in the string between block A and block B? 2. Relevant equations F=ma 3. The attempt at a solution I am unsure of how to approach the first part of the problem. For the second part, since t is the only force acting this the block, I have: T=ma I solve for A from the first part of the equation where t is given as follows: t=ma 3=.400a a=3/.4 a=7.5 m/s^2 I plugged this into to solve for the other tension as follows: t=ma t=.4*7.5 t=3 Mastering physics is saying the tension and the acceleration is wrong. Where did I screw up? 


#2
Oct3108, 09:40 PM

HW Helper
P: 5,341

What is the order of your blocks?
T <{A}{B}{C} Generally, whatever your force is, the acceleration will be F/(3*m) and then the intermediate tensions would be whatever force is needed to keep the blocks remaining moving with that acceleration. In the example above that would be 2/3*F between A:B and 1/3*F between B:C 


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