Hi, I would be happy if you could solve and explain following problem: Imagine some solid long object (wooden plank for example) being just like that in vacuum, free, without being fixed to any point of space. Then, imagine only one forse pushing this object in a certain point of object, perpendicular to object's length. This force remains the same during time. What I want to know is, how would such object move in space. I guess it will experience both translational and rotational motions. But where will be the axis of rotation? And how would speed of translation and rotation depend on strength of the force, on the mass of the plank and on the operation point of the force.. image for visualization h*t*t*p://imageshack.us/photo/my-images/52/physicsimg.png/ Sorry for my bad english at some points, hope you understand the problem anyway.