Displacement, Velocity and Acceleration
In classical mechanics, kinematics deals with the motion of a particle. It deals only with the position, velocity, acceleration, and displacement of a particle. It has no concern about the source of motion.
Linear Displacement
The term "displacement" refers to when something shifts away from its original "location," and "linear" refers to a straight line. As a result, “Linear Displacement” can be described as the movement of an object in a straight line along a single axis, for example, from side to side or up and down. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Linear displacement is usually measured in millimeters or inches and may be positive or negative.
Consider the velocity vs. time graph of a person in an elevator shown in Suppose the elevator is initially at rest.
It then accelerates for 3 seconds, maintains that velocity for 15 seconds, then decelerates for 5 seconds until it stops. The
acceleration for the entire trip is not constant so we cannot use the equations of motion from Motion Equations for Constant
Acceleration in One Dimension for the complete trip. (We could, however, use them in the three individual sections where
acceleration is a constant.) Sketch graphs of (a) position vs. time and (b) acceleration vs. time for this trip.
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