PHYS 101 Lecture Notes - Lecture 4: Friction, Horse Length, Mg Mgb
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One of the central concepts in newtonian dynamics is that of uniform motion. In figure 1a-e are shown the positions of a particle at regular intervals of time. The motion of the particle can be described as follows: [a] the velocity v = constant = 0 , the particle is at rest. [b] the velocity v = vi, where v is constant . [c] the speed is increasing, the direction remains unchanged. [d] the speed is constant, the direction of motion is changing. [e] the speed and the direction of motion are changing. Thus, velocity is not constant and the particle has an acceleration. [i] motion with constant velocity implies motion in a straight line with constant speed. When a particle moves with constant velocity it is said to be in a state of uniform motion. [ii] a particle not moving in a straight line is necessarily accelerating (fig. 1d,e): newton"s laws.
