Class 9 Science Notes

Chapter 7 Motion

Motion:  Distance and displacement, velocity; uniform and non-uniform motion along a straight line; acceleration, distance-time and velocity-time graphs for uniform motion and uniformly accelerated motion, elementary idea of uniform circular motion.

Chapter 8 Force and Laws of Motion

Force may be defined as a pull or push which changes or tends to changes the state of rest or state of motion of a body.

•         If force is applied directly on a body then force is called contact force and if force is applied without actual contact from a distance then it is called action at a distance.

Chapter 9 Gravitation and Flotation

Gravitation and Flotation, Universal Law of Gravitation, Force of Gravitation of the earth (gravity), Acceleration due to Gravity; Mass and Weight; Free fall. Thrust and Pressure. Archimedes’ Principle; Buoyancy.