Skip to main content
1 of 2

Is there extra energy in this system and where does it come from?

In the first case, there is no torque acting and therefore it wont rotate.
But in the second case it should rotate as there is torque.

Somewhere in the picture below I feel like I have made a mistake, but I am unable to figure out where.
Where is the mistake that leads me to believe there would be more energy in the second case?
And if it isn't a mistake, where does the extra energy come from?

enter image description here enter image description here