Question

Problems with conservation of momentum of systems, if you draw the free body diagram, then write the equations and then add them togheter; if momentum is conserved along an axis you will always get that the sum of the forces must be equal to zero in the equations of the dynamic along the axis where momentum is conserved, is that right?

Answer 1

Yes, that is correct. When momentum is conserved along an axis, the sum of the forces in the equations of dynamics along that axis must be equal to zero.

Step-by-step explanation:

Yes, that is correct. When momentum is conserved along an axis, the sum of the forces in the equations of dynamics along that axis must be equal to zero. This is because, according to Newton's second law, the net force acting on an object is equal to the rate of change of its momentum. If momentum is conserved, then the rate of change of momentum is zero, so the sum of the forces must be zero.