Motion.
Motion,—is the changing of place, or the opposite to a state of rest.
Velocity.
Velocity,—is the rate of motion; there are four rates of motion, viz., Uniform, Variable, Accelerated, and Retarded.
1st. Uniform.
1st. Uniform,—when a particle traverses equal distances, in any equal successive portion of time.
2nd. Variable.
2nd. Variable,—when the spaces passed over in equal times, are unequal.
3rd. Accelerated.
3rd. Accelerated,—when the distances traversed in equal times are successively greater and greater.