He pulled back, having to exert considerable force against her surprising strength.
In winter the varying depth of snow may exert an appreciable effect.
But he continued to exert all his powers to restrain his troops from attacking.
Thus although at a slow speed the engine can exert a tractive force of 18,600 lb, at 60 m.
In order to exert force, or at all events that force of reciprocal pressure which we best understand, and on which, in impact, the third law of motion was founded, there are always at least two bodies, enduring, triply extended, mobile, each inert, mutually impenetrable or resistent, different yet similar; and in order to have produced any effect but equilibrium, some bodies must at some time have differed either in mass or in velocity, otherwise forces would only have neutralized one another.