Momentum–depth relationship in a rectangular channel Momentum–depth relationship in a rectangular channel In classical physics, momentum is the product of mass and velocity and is a vector quantity, but in fluid mechanics it is treated as a longitudinal quantity (i.e. one dimension) evaluated in the direction of flow. Additionally, it is evaluated as momentum per unit time, corresponding to the product of mass flow rate and velocity, and therefore it has units of force. The momentum forces considered in open channel flow are dynamic force – dependent of depth and flow rate – and static force – dependent of depth – both affected by gravity. The
Velocity (software development) more like the concept of directionless “speed” from physics. A third problem with velocity is that it is often misused as a measure of efficiency or team performance. Velocity is a metric of work done, not efficiency. Velocity can be increased by working overtime or adding team members, neither of which necessarily increase efficiency or performance. In summary, velocity is a problematic metric because it is easy to manipulate and often misused as an indicator of efficiency. Velocity (software development) Velocity is a metric for work done, which is often used in agile software development. Measuring velocity is sometimes called