Stated in terms of momentum, Newton's second law says net external force equals change in momentum divided by:

1. Force acting over time can change momentum. 2. The net external force equals the change in momentum of a system divided by the time over which it changes. 3. This is the most broadly applicable form of the second law. 4. Dividing by mass would give an acceleration rather than a force. _Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 8 'Linear Momentum and Collisions', sections 8.1-8.7_