Class 9 Science – Motion (Ultimate Exam Notes)
These notes are designed to help you revise quickly and score maximum marks in exams.
They include concepts, formulas, examples, and exam tips in a clean structured format.
1. What is Motion?
Motion is defined as the change in position of an object with respect to time.
If an object changes its position over time, it is said to be in motion.
Examples include a moving car, a flying airplane, or a person walking.
Even Earth is in motion as it rotates and revolves.
2. Types of Motion
Rectilinear Motion: Motion in a straight line, like a car on a highway.
Circular Motion: Motion along a circular path, like a fan or wheel.
Periodic Motion: Motion that repeats after equal intervals of time, like a pendulum.
3. Distance vs Displacement
Distance is the total path covered by an object.
Displacement is the shortest distance from initial to final position.
Distance is a scalar quantity, displacement is a vector.
Distance is always greater than or equal to displacement.
