Class 9 Motion Link: Watch the lecture on motion Also read NCERT text book, Link Assignment 1 Chapter : Motion 1. What is meant by the statement ‘Rest and motion are relative terms’? Give example to show it. 2. Explain whether the walls of a classroom are at rest or in motion. 3. Define scalar and vector quantities. 4. Identify the following as scalar or vector quantities:- mass, velocity, speed, length, distance, displa...