9 TH- PHYSICS

Force and Motion, 

Newton’s Laws of Motion,

 Action and Reaction forces,

 Inertia of a body, 

Inertia and mass,

 Momentum, 

Force and Acceleration. 

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. 

Gravitation;

 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. 

Work done by a Force,

 Energy, power; 

Kinetic and Potential energy; 

Law of conservation of energy (excluding commercial unit of Energy). 

Nature of sound and its propagation in various media,

 speed of sound, 

range of hearing in humans

ultrasound; 

reflection of sound; 

echo.