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Non-Newtonian Mechanics :— The Direction of Force and Acceleration.

By Richard C. Tolman, Ph.D., Instructor in Physical Chemistry at the University of Michigan^[1].

If force is defined as the rate of increase of momentum, the equation

${\mathsf {F}}={\frac {d}{dt}}(m{\mathsf {u}})=m{\frac {d{\mathsf {u}}}{dt}}+{\frac {dm}{dt}}{\mathsf {u}}$

(1)

allows for a change in mass as well as a change in

1. Communicated by the Author.