There is no actual difference. Momentum is singular and momenta is plural. A group is referred with momenta and a single ball as momentum. Momentum. read more
Momentum (Linear momentum) is defined as the product of mass and velocity. It is one of the most important physical quantities of a system, and it is a conserved property in the universe, both at microscopic and macroscopic levels. read more
• Momentum of a moving body is the product of its mass and its velocity whereas impulse is change in momentum which is the product of mass and difference in velocities. Related Links: 1. read more