Class VI - Science

Chapter - 10 Motion and Measurement of Distances

Different modes of transport are used to go from one place to another.
In ancient times, people used length of a foot, the width of a finger, the distance of a step as units of measurement. This caused confusion and a need to develop a uniform system of measurement arose.
Now, we use International System of Unit (SI unit). This is accepted all over the world.
Meter is the unit of length in SI unit.
Motion is a change in the position of an object with time. The change in this position can be determined through distance measurements.
Motion in a straight line is called rectilinear motion. The falling of a stone is an example of rectilinear motion.
In circular motion an object moves such that its distance from a fixed point remains the same. The motion of a point marked on the blade of an electric fan or the hands of a clock are examples of circular motion.
Motion that repeats itself after some period of time is called periodic motion. Motion of a pendulum, a branch of a tree moving to and fro, motion of a child on a swing, strings of a guitar or the surface of drums (tabla) being played, are all examples of periodic motion.

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