The various aspects of the motion of an object can be understood in terms of a few physical quantities such as displacement, velocity, acceleration and time. Galileo is the first to discover that the motion of an object can be described in terms of two fundamental quantities namely length and time and two derived quantities namely velocity and acceleration.
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Let us discuss about the displacement.What is zero displacementLet us first know about the displacement. Suppose that a particle is moving from a point A to another point B. The path followed by the particle in going from A to B may be of any shape, a curved line such that ACB or a series of the straight path AL, LM and then MB. In fact, there is infinite number of the possible paths to go from A to B.
Now draw an arrow from initial position A to the final position B of the particle. Then, the vector AB so drawn is called the displacement of the particle in going from the point A to B. It is independent of the actual path that may have been followed by the particle in going from its initial to the final position.Image on displacement
Thus we can say that the displacement of a particle is defined as the change in position of the particles in a particular direction and is given by a vector drawn from its initial position to the final position. If the change in the position of the body or the particle is zero then we can say that it is zero displacement.
The displacement in any complete path or the closed path is always zero.Example based on the zero displacementA particle is moving around a circular path of radius 14 cm. Find the distance and the displacement covered in one complete revolution.SolutionHere, r = 14 cmDistance = circumference of the circular path = `(2 *22 * 14) / 7` = 88 cmAs the distance between the final and the initial position of the body is zero, thus the displacement = 0 cm