problem with acceleration using addtorque/settorque

Hi,
I am applying a constant torque to my object using settorque / addtorque in every frame. I expect the object to accelerate. That means, the object's velocity to be increased continuously. but its not happening. The velocity reaches some value and it remains constant. Hos is it happening? Can I avoid this situation? Can anybody throw any idea on this?? Thanks in advance.

Prathap

This is perhaps due to friction, did you set it to zero?

There is also linear and angular damping, you can set these to zero to have total control.

i never understand what are linear and angular damping.

Any explanation will be great.

It is simply force in opposite direction of movement (linear) or rotation (angular) that is proportional to speed. It somewhat simulates drag and makes things bit more stable. You can set the damping coefficents to zero and apply your own damping in force callback.

Thanks for the reply. Problem is solved by setting linear damping value as required. But, what i did not understand is the term damping. How is Damping in physics related to speed? And in Newton, what is the equation that relates damping coeff. to speed? Any idea???
Prathap