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Chemist@
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Homework Statement
Three bodies with masses m1 m2 and m3 connected with a string through a sheave with a body with mass m4. The system is moving right. Write the second Newton law for the movement of the objects. Ignore friction.
Homework Equations
2nd law for bodies:
m4a= m4g-T(the force of stretching the string)
m1a= T
m2a= T
m3a= T
The Attempt at a Solution
By summing up the last three equation I got:
a(m1+m2+m3)=3T but it is apparently incorrect. The book equation is:
a(m1+m2+m3)=T, how? Where am I wrong at?