Hi everyone, I have a very simple and classic question here. Suppose I have a 10cm,0.01kg ruler (uniform density) in space. And I apply a 1N force 2 cm from the left end of it. What happened at this instance? I guess centre of the ruler will start to accelerate as a=F/m=100ms^2. But what about the torque? which point should I consider as the pivot position. (Here I want what happen at the very first instance only). Is it the centre of mass? If it yes, why?? Thank you for answering!!