Physics

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(Apparently, I'm not allowed to post URLs, but this question is better illustrated by a diagram, i39. tinypic. com/ 17e336. jpg)

<--P--[BOX A]<--Q--[BOX B]<--R--[BOX C]
There are three boxes attached together with string and being pulled across a frictionless surface. Box A has a mass of 2 kg, box B has a mass of 4 kg and box C has a mass of 4 kg. The strings are labelled P, Q and R respectively.

The force of tension for string P is 250 N. I have to find the force of tension for strings Q and R.
---
On a system diagram of the entire system, I already found the acceleration (a = F/m = (250/10) = 25 m/s^2). This acceleration is the same for the whole system, right? But I don't know how to find the forces of tension for strings Q and R.
Any help?
Thanks.

  • Physics -

    Yes, the acceleration is for all of them.

    The tension on each string is the mass following that string times the acceleration.

  • Physics -

    Then for FTQ (force of tension of string Q):
    F=ma
    =(8)(25)
    =200 m/s^2

    FTR
    F=ma
    =(4)(25)
    =100 m/s^2
    ??

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