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I must be blinded by something; please help.
Consider a modified Atwood machine, a horizontal
frictionless table with two massless and frictionless
pulleys. The vertically suspended mass on the left, m1,
is smaller than the vertically suspended mass on the
right, m3.
...
But what is wrong with the following reasoning?
I am interested in what happens to m2. Therefore I
draw the free body diagram for m2 with four forces.
Vertical forces cancel. The remaining two forces are
F1=m1*g (to the leftt) and F3=m3*g (to the right).
The net force on m2 must thus be F=(m3-m1)*g; it is
directed to the right. ...