Explanation

Dyne is the unit of force because it is defined as $1 ext{ gram} imes 1 ext{ cm/s}^2$. Pressure is measured in units like Pascal or $ ext{dyne}/ ext{cm}^2$. Velocity is measured in units of length per time, such as $ ext{cm/s}$. Momentum is measured in units of mass times velocity, such as $ ext{g} imes ext{cm/s}$.