1. The problem statement, all variables and given/known data 1. Is it possible for a particle to describe a curved path if no force acts on it? Is the answer reference frame dependent? YES, when the body stays still but the frame describes a curved path. Then with respect to that frame the body will describe curves but no force would act on particle. Will we count pseudo force as a force? 2. It is sometimes heard that inertial frame of reference does not actually exists and is only an ideal concept. Comment. I totally agree with the view. almost every thing practical has absolute acceleration. Ar my views compatible? 3. An object is placed far away from all objects that can exert force on it. A reference frame is taken by taking the origin and axes fix in this. Will th frame be necessarily inertial? I think yes. But I am not very confident.