Torque & Joules: Fact or Fiction?

[Entanglement]

You are thinking of a couple, where two forces are used to create a torque without producing a net force. See: http://en.wikipedia.org/wiki/Couple_(mechanics)

Is the energy done by a couple is equal to zero ?

 

[adjacent]

Is the energy done by a couple is equal to zero ?

Why should it be zero?
If the rod starts rotating,it gains rotational kinetic energy.

 

[Entanglement]

Why should it be zero?

If the rod starts rotating,it gains rotational kinetic energy.

I have no idea about rotational mechanics, linear only.

 

[Vanadium 50]

I have no idea about rotational mechanics, linear only.

You will have a very difficult time understanding toque thinking only about linear mechanics.