Asked by Toby

Hey.. I don't know exactly how to get the solution for this one...

doubleudoubleudouble dot physikerboard.de/files/fahrzeug_223.jpg

(its a sketch i made with paint^^)

We assume there are no frictions at all and we only look at the masses M, m1 and m2.

I want to know how much force do i have to give to push M in such a way that it accelerates so fast that m1 and m2 wont move related to M?


Answered by bobpursley
No friction? then the inertia on m1 tending to move it back (m1*a) is pulling on the cord, equalling in tension m2*g


first, what is a:

F=(M+m1+m2)a solve for a.

then m1*a=m2*g
m1(F/(M+m1+m2))=m2g

solve for F, check my math.
Answered by Toby
Ah great thank you. I got problems with it because there are no frictions...i can hardly imagine how the masses behave but ill get an "eye" for it. Seems very right, big thanks!
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