We define linear momentum as mass times velocity and introduce impulse, the product of force and time. The impulse-momentum theorem states that impulse equals momentum change. Internal forces within a...We define linear momentum as mass times velocity and introduce impulse, the product of force and time. The impulse-momentum theorem states that impulse equals momentum change. Internal forces within a system do not alter total momentum, while external forces do. Conservation of momentum applies if no net external force acts. We categorize systems as closed (isolated from external forces) or open, allowing exchanges. This model underpins analysis of interactions like collisions.
