motion is the same at any velocity. Hence,the friction is said to be a constant or uniformretarding force of the same intensity , ichatevei-be the velocity with ichicli the body is moved, —and that the force or intensity of pressurerequired to act upon the body, to move it overany determinate space at different velocities,will be the same at each instant of time ; con-sequently, the aggregate amount of powerrequired to drag any body over a given space,will always be the same, whatever be the velo-city ; but, if we traverse that space in half thetime, it will of course require the movingpower to travel at twice the velocity; and,therefore, the aggregate effort of mechanicalpower required will be double, acting half thetime; and, at different velocities, will be repre-sented by the following diagram.

I.

Velocities

Spaces passed overTimes - -

Resistance

Mechanical force required,acting in the above timeMechanical force required,for any given distance

If experiment proves that the intensity offorce required to urge the body forward is

12 3 4111111111111

12 3 4

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