1. The problem statement, all variables and given/known data An rectangular object(mass m) sliding on a horizontal plane (surface is frictionless), with a speed V, object height H. then hits a rectangular obstacle with height h. V is large enough to cause tripping 2. Relevant equations what is the relation between linear momentum / angular momentum / conservation of momentum 3. The attempt at a solution is this what's happening; the object has a momentum of P=mV. then an impulse I=t*F is applied to the object by the obstacle. This impulse reduces the linear momentum to P'=m*V-F*x ---This m*V-Fx gives the angular momentum(with respect to the point of contact) causing the rotation?--- I am not sure if my thinking is correct, especially my last statement. An alternative is; taking initial mV as an angular momentum with changing radius wrt the contact point??? ie not mentioning linear momentum at all? Thanks in advance.