Physics Notes – Motion and Time (Class 7)
Motion is the change in position of an object with time. If an object changes its position relative to its
surroundings, we say it is in motion. Examples include a moving car, a flying bird, or a rotating fan.
Types of Motion
Type of Motion Explanation Example
Rectilinear Motion Motion in a straight line Train moving on a straight track
Circular Motion Motion in a circular path Hands of a clock
Periodic Motion Motion repeating after equal time intervals Pendulum swing
Speed
Speed tells us how fast or slow an object is moving. Formula: Speed = Distance / Time Unit of
speed in SI system is metre per second (m/s).
Distance–Time Graph
A distance-time graph shows how distance changes with time. A straight slanted line indicates
uniform motion (constant speed).
Simple Pendulum
