It is sometimes referred to ‘mass in motion’: all objects have mass, thus if it is moving it has momentum. There are two types of momentum. One is linear momentum (P) of a moving rigid body, which is the product of its mass (m) and velocity (v). Thus, P=mv. This type is called upon by sports commentators to express a player’s power play (“his momentum carried him over the score line”), and it should be compared to the meaning of force. The other is angular momentum (Lω) of a rigid body, and is is the product of the angular velocity (ω) and its moment of inertia (I) about the axis of rotation. Thus, L = Iω.
See Force, Mass, Moment of inertia (I), Velocity