Linear momentum is a vector quantity defined as the product of an object's mass, m, and its velocity, v. Linear momentum is denoted by the letter p and is called “ momentum ” for short: Note that a body's momentum is always in the same direction as its velocity vector. The units of momentum are kg. · m/s. Equations Equation Symbols Meaning in words p = mv p = m v p, equals, m, v p p p is momentum, m m m is mass, and v v v is velocity Momentum is mass times velocity. \Delta p = F_\text {net} \Delta t Δ p = F net Δ t delta, p, equals, F, start subscript, n, e, t, end subscript, delta, t F_\text {net} F net F, start subscript, n, e, t, end subscript is the net external force, \Delta p Δ p delta, p is change in momentum, and \Delta t Δ t delta, t is the time over which a net force acts How momentum and net force are related You might recall from the kinematic equation...