NCERT Solutions for Class 7 Chapter 3 Motion and Time

Motion is a change in position of an object concerning time. Motion is typically described in terms of displacement, distance (scalar), velocity, acceleration, time and speed. Oscillatory motion is a motion where a body moves between two extreme positions. The centre of these extreme positions is called mean position. Time taken to complete one oscillation is called the Time Period. The motion of the earth about its own axis around the sun is an example of rotary motion.