- Homework Statement:
- I am trying to solve a problem by torques and conversation of energy, but the answers don't match.
- Relevant Equations:
t = rf
E = constant
By third Newton's law, i would imagine that fa = -fb, so
and assuming f to be the average value
torque in A
-ra*f*t = Waf - Wao
torque in b
rb*f*t = Wbf
Ia*wo² = Ib*wbf² + Ia*waf²
it Looks right to you? I really appreciate this method that i thought, but the answers don't match, and i don't know what is wrong.
THe justification to use the conservation of mechanic would be: The work done by one force will be equal to the work done by the reaction force, but opposite in signal, so it cancel.