Properties of Motion (Kinematics)
we shall examine some general properties of motion that is restricted in three ways.
- The motion is along a straight line only.The line may be vertical, horizontal, or slanted, but it must be straight.
- Forces (pushes and pulls) cause motion . In this chapter we discuss only the motion itself and changes in the motion. Does the moving object speed up, slow down, stop, or reverse direction? If the motion does change, how is time involved in the change?
- The moving object is either a particle (by which we mean a point-like object such as an electron) or an object that moves like a particle (such that every portion moves in the same direction and at the same rate). A stiff pig slipping down a straight playground slide might be considered to be moving like a particle; however, a tumbling tumbleweed would not.
Ref : Fundamentals of Physics
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